A paragraph in the First Book of the Hypotyposes which has given rise to much speculation and many different theories, is the comparison which Sextus makes of Scepticism with the philosophy of Heraclitus.[1] In this paragraph the statement is made that Aenesidemus and his followers, ο? περ? τ?ν Α?νησ?δημον, said that Scepticism is the path to the philosophy of Heraclitus, because the doctrine that contradictory predicates appear to be applicable to the same thing, leads the way to the one that contradictory predicates are in reality applicable to the same thing.[2] ο? περ? τ?ν Α?νησ?δημον ?λεγον ?δ?ν ε?ναι τ?ν σκεπτικ?ν ?γωγ?ν ?π? τ?ν ?ρακλε?τειον φιλοσοφ?αν, δι?τι προηγε?ται το? τ?ναντ?α περ? τ? α?τ? ?π?ρχειν τ? τ?ναντ?α περ? τ? α?τ? φα?νεσθαι. As the Sceptics say that contradictory predicates appear to be applicable to the same thing, the Heraclitans come from this to the more positive doctrine that they are in reality so.[3]

[1] Hyp. I. 210.

[2] Hyp. I. 210.

[3] Hyp. I. 210.

This connection which Aenesidemus is said to have affirmed between Scepticism and the philosophy of Heraclitus is earnestly combated by Sextus, who declares that the fact that contradictory predicates appear to be applicable to the same thing is not a dogma of the Sceptics, but a fact which presents itself to all men, and not to the Sceptics only. No one for instance, whether he be a Sceptic or not, would dare to say that honey does not taste sweet to those in health, and bitter to those who have the jaundice, so that Heraclitus begins from a preconception common to all men, as to us also, and perhaps to the other schools of philosophy as well.[1] As the statement concerning the appearance of contradictory predicates in regard to the same thing is not an exclusively sceptical one, then Scepticism is no more a path to the philosophy of Heraclitus than to other schools of philosophy, or to life, as all use common subject matter. "But we are afraid that the Sceptical School not only does not help towards the knowledge of the philosophy of Heraclitus, but even hinders that result. Since the Sceptic accuses Heraclitus of having rashly dogmatised, presenting on the one hand the doctrine of 'conflagration' and on the other that 'contradictory predicates are in reality applicable to the same thing.'"[2] "It is absurd, then, to say that this conflicting school is a path to the sect with which it conflicts. It is therefore absurd to say that the Sceptical School is a path to the philosophy of Heraclitus."[3]

[1] Hyp. I. 211.

[2] Hyp. I. 212.

[3] Hyp. I. 212.

This is not the only place in the writings of Sextus which states that Aenesidemus at some time of his life was an advocate of the doctrines of Heraclitus. In no instance, however, where Sextus refers to this remarkable fact, does he offer any explanation of it, or express any bitterness against Aenesidemus, whom he always speaks of with respect as a leader of the Sceptical School. We are thus furnished with one of the most difficult problems of ancient Scepticism, the problem of reconciling the apparent advocacy of Aenesidemus of the teachings of Heraclitus with his position in the Sceptical School.

A comparison with each other of the references made by Sextus and other writers to the teachings of Aenesidemus, and a consideration of the result, gives us two pictures of Aenesidemus which conflict most decidedly with each other. We have on the one hand, the man who was the first to give Pyrrhonism a position as an influential school, and the first to collect and present to the world the results of preceding Sceptical thought. He was the compiler of the ten Tropes of ?ποχ?, and perhaps in part their author, and the author of the eight Tropes against aetiology.[1] He develops his Scepticism from the standpoint that neither the senses nor the intellect can give us any certain knowledge of reality.[2] He denied the possibility of studying phenomena as signs of the unknown.[3] He denied all possibility of truth, and the reality of motion, origin and decay. There was according to his teaching no pleasure or happiness, and no wisdom or supreme good. He denied the possibility of finding out the nature of things, or of proving the existence of the gods, and finally he declared that no ethical aim is possible.

[1] Hyp. I. 180.

[2] Photius 170, B. 12.

[3] Adv. Math. VIII. 40.

The picture on the other hand, presented to us by Sextus and Tertullian, is that of a man with a system of beliefs and dogmas, which lead, he says, to the philosophy of Heraclitus. In strange contradiction to his assertion of the impossibility of all knowledge, he advocates a theory that the original substance is air,[1] which is most certainly a dogma, although indeed a deviation from the teachings of Heraclitus, of which Sextus seemed unconscious, as he says, τ? τε ?ν κατ? τ?ν ?ρ?κλειτον ??ρ ?στιν, ?? φησ?ν ? Α?νησ?δημο?. Aenesidemus dogmatised also regarding number and time and unity of the original world-stuff.[2] He seems to have dogmatised further about motion,[3] and about the soul.[4]

If Sextus' language is taken according to its apparent meaning, we find ourselves here in the presence of a system of beliefs which would be naturally held by a follower of the Stoic-Heraclitan physics,[5] and absolutely inexplicable from the standpoint of a man who advocated so radical a Scepticism as Aenesidemus. Sextus in the passage that we first quoted,[6] expresses great indignation against the idea that Scepticism could form the path to the philosophy of Heraclitus, but he does not express surprise or indignation against Aenesidemus personally, or offer any explanation of the apparent contradiction; and while his writings abound in references to him as a respected leader of the Sceptical School, he sometimes seems to include him with the Dogmatics, mentioning him with the δογματικ?ν φιλοσ?φων. [7] In fact, the task of presenting any consistent history of the development of thought through which Aenesidemus passed is such a puzzling one, that Brochard brilliantly remarks that possibly the best attitude to take towards it would be to follow the advice of Aenesidemus himself, and suspend one's judgment altogether regarding it. Is it possible to suppose that so sharp and subtle a thinker as Aenesidemus held at the same time such opposing opinions?

[1] Adv. Math. X. 233.

[2] Adv. Math. IX. 337; X. 216.

[3] Adv. Math. X. 38.

[4] Adv. Math. VII. 349.

[5] Compare Zeller Op. cit. III. p. 33.

[6] Hyp. I. 210-212.

[7] Adv. Math. VIII. 8; X. 215.

The conjecture that he was first a Heraclitan Stoic, and later a Sceptic, which might be possible, does not offer any explanation of Sextus' statement, that he regarded Scepticism as a path to the philosophy of Heraclitus. Nor would it be logical to think that after establishing the Sceptical School in renewed influence and power, he reverted to the Heraclitan theories as they were modified by the Stoics. These same theories were the cause of his separation from the Academy, for his chief accusation against the Academy was that it was adopting the dogmatism of the Stoics.[1] The matter is complicated by the fact that Tertullian also attributes to Aenesidemus anthropological and physical teachings that agree with the Stoical Heraclitan doctrines. It is not strange that in view of these contradictory assertions in regard to the same man, some have suggested the possibility that they referred to two different men of the same name, a supposition, however, that no one has been able to authoritatively vindicate.

Let us consider briefly some of the explanations which have been attempted of the apparent heresy of Aenesidemus towards the Sceptical School. We will begin with the most ingenious, that of Pappenheim.[2]

Pappenheim claims that Sextus was not referring to Aenesidemus himself in these statements which he joins with his name. In the most important of these, the one quoted from the Hypotyposes,[3] which represents Aenesidemus as claiming that Scepticism is the path to the philosophy of Heraclitus, the expression used is ο? περ? τ?ν Α?νησ?δημον, and in many of the other places where Sextus refers to the dogmatic statements of Aenesidemus, the expression is either ο? περ? τ?ν Α?νησ?δημον, or Α?νησ?δημο? καθ? ?ρ?κλειτον, while when Sextus quotes Aenesidemus to sustain Scepticism, he uses his name alone.

[1] Compare Zeller Op. cit. III. p. 16.

[2] Die angebliche Heraclitismus des Skeptikers Ainesidemos, Berlin 1889.

[3] Hyp. I. 210-212.

Pappenheim thinks that Sextus' conflict was not with the dead Aenesidemus, who had lived two centuries before him, but with his own contemporaries. He also seeks to prove that Sextus could not have gained his knowledge of these sayings of Aenesidemus from any of Aenesidemus' own writings, as neither by the ancients, nor by later writers, was any book spoken of which could well have contained them. Neither Aristocles nor Diogenes mentions any such book.

Pappenheim also makes much of the argument that Sextus in no instance seems conscious of inconsistency on the part of Aenesidemus, even when most earnestly combating his alleged teachings, but in referring to him personally he always speaks of him with great respect.

Pappenheim suggests, accordingly, that the polemic of Sextus was against contemporaries, those who accepted the philosophy of Heraclitus in consequence of, or in some connection with, the teachings of Aenesidemus. He entirely ignores the fact that there is no trace of any such school or sect in history, calling themselves followers of "Aenesidemus according to Heraclitus," but still thinks it possible that such a movement existed in Alexandria at the time of Sextus, where so many different sects were found. Sextus use Aenesidemus' name in four different ways:-alone, ο? περ? τ?ν Α?νεσ?δημον, Α?νησ?δημο? καθ? Ηρ?κλειτο?, and in one instance ο? περ? τ?ν Α?νησ?δημον καθ? ?ρ?κλεντον. [1]

[1] Adv. Math. VIII. 8.

Pappenheim advances the theory that some of these contemporaries against whom Sextus directed his arguments had written a book entitled Α?νησ?δημο? καθ? ?ρ?κλειτον, to prove the harmony between Aenesidemus and Heraclitus, and that it was from this book that Sextus quoted the dogmatic statements which he introduced with that formula. He claims, further, that the passage quoted from Hypotyposes I. even, is directed against contemporaries, who founded their system of proofs of the harmony between Aenesidemus and Heraclitus on the connection of the celebrated formula which was such a favourite with the Sceptics: "Contrary predicates appear to apply to the same thing," with the apparent deduction from this, that "Contrary predicates in reality apply to the same thing." Sextus wishes, according to Pappenheim, to prove to these contemporaries that they had misunderstood Aenesidemus, and Sextus does not report Aenesidemus to be a Dogmatic, nor to have taught the doctrines of Heraclitus; neither has he misunderstood Aenesidemus, nor consequently misrepresented him; but on the contrary, these dogmatic quotations have nothing to do with Aenesidemus, but refer altogether to contemporaries who pretended to be Sceptics while they accepted the teachings of Heraclitus. Sextus naturally warmly combats this tendency, as he wishes to preserve Pyrrhonism pure.

Brochard advocates a change of opinion on the part of Aenesidemus as an explanation of the difficulty in question.[1] He starts from the supposition, the reasonableness of which we shall consider later, that Aenesidemus had passed through one change of opinion already when he severed his connection with the New Academy; and to the two phases of his life, which such a change has already made us familiar with, he adds a third. Aenesidemus would not be the first who has accepted different beliefs at different periods of his life, and Brochard claims that such a development in the opinions of Aenesidemus is logical. He does not accuse Aenesidemus of having, as might seem from the perusal of Sextus, suddenly changed his basis, but rather of having gradually come to accept much in the teachings of Heraclitus. Aenesidemus modifies his Scepticism only to the extent of pretending to know something of absolute reality. The Sceptic says, "Contradictory predicates are apparently applicable to the same thing," and Aenesidemus accepts the Heraclitan result-"Contradictory predicates are in reality applicable to the same thing." From Sextus' report, Aenesidemus would seem to have renounced his position as a Sceptic in saying that Scepticism is the path to the philosophy of Heraclitus. He does not, however, renounce Scepticism, but he finds it incomplete. In deliberating concerning the appearance of contradictory predicates in regard to the same object, he would naturally ask, "Whence come these contradictory appearances?" After having doubted all things, he wished to know wherefore he doubts. The system of Heraclitus offers a solution, and he accepts it. Contradictory predicates produce equilibrium in the soul because they are an expression of reality.

[1] Brochard Op. cit. 272.

As a Sceptic he claims that knowledge is impossible, and he does not find that the statement of Heraclitus disproves this, but rather that it supports his theory. He had denied the existence of science. He still does so, but now he knows why he denies it. Brochard asks why it is any more impossible that Aenesidemus should have been a follower of Heraclitus than that Protagoras was so, as Protagoras was after all a Sceptic. In conclusion, Brochard claims that the dogmatic theories attributed to Aenesidemus relate to the doctrine of the truth of contradictory predicates, which seemed to him a logical explanation of the foundation theories of Scepticism. It is right to call him a Sceptic, for he was so, and that sincerely; and he deserves his rank as one of the chiefs of the Sceptical School.

Coming now to the opinion of Zeller,[1] we find that he advocates a misconception of Aenesidemus on the part of Sextus. The whole difficulty is removed, Zeller thinks, by the simple fact that Sextus had not understood Aenesidemus; and as Tertullian and Sextus agree in this misconception of the views of Aenesidemus, they must have been misled by consulting a common author in regard to Aenesidemus, who confused what Aenesidemus said of Heraclitus with his own opinion. Zeller maintains that the expression so often repeated by Sextus-Α?νησ?δημο? καθ? ?ρ?κλειτον -shows that some one of Aenesidemus' books contained a report of Heraclitus' doctrines, as Aenesidemus was in the habit of quoting as many authorities as possible to sustain his Scepticism. To justify his quotations from Heraclitus, he had possibly given a short abstract of Heraclitus' teachings; and the misconception advocated by Zeller and found both in Tertullian and Sextus, refers rather to the spirit than to the words quoted from Aenesidemus, and is a misconception due to some earlier author, who had given a false impression of the meaning of Aenesidemus in quoting what Aenesidemus wrote about Heraclitus. That is to say, Heraclitus was classed by Aenesidemus only among those who prepared the way for Scepticism, just as Diogenes[2] mentions many philosophers in that way; and that Soranus[3] and Sextus both had the same misunderstanding can only be explained by a mistake on the part of the authority whom they consulted.

[1] Zeller Op. cit. III, pp. 31-35; Grundriss der Geschichte der Griechischen Phil. p. 263.

[2] Diog. Laert. IX. 11, 71-74.

[3] Tertullian.

This explanation, however, makes Sextus a very stupid man. Aenesidemus' books were well known, and Sextus would most certainly take the trouble to read them. His reputation as an historian would not sustain such an accusation, as Diogenes calls his books τ? δ?κα τ?ν σκεπτικ?ν κα? ?λλα κ?λλιστα. [1] Furthermore, that Sextus used Aenesidemus' own books we know from the direct quotation from them in regard to Plato,[2] which he combines with the ideas of Menodotus[3] and his own.

[1] Diog. IX. 12, 116.

[2] Hyp. I. 222.

[3] Following the Greek of Bekker.

Sextus' references to Aenesidemus in connection with Heraclitus are very numerous, and it is absurd to suppose that he would have trusted entirely to some one who reported him for authority on such a subject. Even were it possible that Sextus did not refer directly to the works of Aenesidemus, which we do not admit, even then, there had been many writers in the Sceptical School since the time of Aenesidemus, and they certainly could not all have misrepresented him. We must remember that Sextus was at the head of the School, and had access to all of its literature. His honor would not allow of such a mistake, and if he had indeed made it, his contemporaries must surely have discovered it before Diogenes characterised his books as κ?λλιστα. Whatever may be said against the accuracy of Sextus as a general historian of philosophy, especially in regard to the older schools, he cannot certainly be accused of ignorance respecting the school of which he was at that time the head.

The opinion of Ritter on this subject is that Aenesidemus must have been a Dogmatic.[1] Saisset contends[2] that Aenesidemus really passed from the philosophy of Heraclitus to that of Pyrrho, and made the statement that Scepticism is the path to the philosophy of Heraclitus to defend his change of view, although in his case the change had been just the opposite to the one he defends. Saisset propounds as a law in the history of philosophy a fact which he claims to be true, that Scepticism always follows sensationalism, for which he gives two examples, Pyrrho, who was first a disciple of Democritus, and Hume, who was a disciple of Locke It is not necessary to discuss the absurdity of such a law, which someone has well remarked would involve an a priori construction of history. There is no apparent reason for Saisset's conjecture in regard to Aenesidemus, for it is exactly the opposite of what Sextus has reported. Strange to say, Saisset himself remarks in another place that we owe religious respect to any text, and that it should be the first law of criticism to render this.[3] Such respect to the text of Sextus, as he himself advocates, puts Saisset's explanation of the subject under discussion out of the question.

[1] Ritter, Op. cit. p. 280. Book IV.

[2] Saisset, Op. cit. p. 206.

[3] Saisset Op. cit. p. 206.

Hirzel and Natorp do not find such a marked contradiction in the two views presented of the theories of Aenesidemus, nor do they think that Sextus has misrepresented them. They rather maintain, that in declaring the coexistence of contradictory predicates regarding the same object, Aenesidemus does not cease to be a Sceptic, for he did not believe that the predicates are applicable in a dogmatic sense of the word, but are only applicable in appearance, that is, applicable to phenomena. The Heraclitism of Aenesidemus would be then only in appearance, as he understood the statement, that "Contradictory predicates are in reality applicable to the same thing," only in the phenomenal sense.[1] Hirzel says in addition, that contradictory predicates are in reality applicable to those phenomena which are the same for all, and consequently true, for Aenesidemus considered those phenomena true that are the same for all.[2] As Protagoras, the disciple of Heraclitus, declared the relative character of sensations, that things exist only for us, and that their nature depends on our perception of them; so, in the phenomenal sense, Aenesidemus accepts the apparent fact that contradictory predicates in reality apply to the same thing.

[1] Natorp Op. cit. 115, 122.

[2] Adv. Math. VIII. 8; Hirzel Op. cit. p. 95.

This explanation entirely overlooks the fact that we have to do with the word ?π?ρχειν, in the statement that contradictory predicates in reality apply to the same thing; while in the passage quoted where Aenesidemus declares common phenomena to be true ones, we have the word ?ληθ?, so that this explanation of the difficulty would advocate a very strange use of the word ?π?ρχειν.

All of these different views of the possible solution of this perplexing problem are worthy of respect, as the opinion of men who have given much thought to this and other closely Belated subjects. While we may not altogether agree with any one of them, they nevertheless furnish many suggestions, which are very valuable in helping to construct a theory on the subject that shall satisfactorily explain the difficulties, and present a consistent view of the attitude of Aenesidemus.

First, in regard to the Greek expression ο? περ? in connection with proper names, upon which Pappenheim bases so much of his argument. All Greek scholars would agree that the expression does not apply usually only to the disciples of any teacher, but ο? περ? τ?ν Α?νησ?δημον, for instance, includes Aenesidemus with his followers, and is literally translated, "Aenesidemus and his followers." It is noticeable, however, in the writings of Sextus that he uses the expression ο? περ? often for the name of the founder of a school alone, as Pappenheim himself admits.[1] We find examples of this in the mention of Plato and Democritus and Arcesilaus, as ο? περ? τ?ν Πλ?τωνα κα? Δημ?κριτον [2] and ο? περ? τ?ν ?ρκεσ?λαον, [3] and accordingly we have no right to infer that his use of the name Aenesidemus in this way has an exceptional significance. It may mean Aenesidemus alone, or it may signify Aenesidemus in connection with his followers.

[1] Pappenheim Op. cit. p. 21.

[2] Adv. Math. VIII. 6.

[3] Adv. Math. VII. 150.

In reply to Zeller's position, that Sextus and Tertullian have misunderstood Aenesidemus, and quote from some common author who misrepresents him, we would admit that such a misunderstanding might be possible where Sextus gives long explanations of Heraclitus' teachings, beginning with quoting Aenesidemus, and continuing in such a way that it is not always possible to distinguish just the part that is attributed to Aenesidemus; but such a misunderstanding certainly cannot be asserted in regard to the direct statement that Aenesidemus regarded Scepticism as the path to the philosophy of Heraclitus, for the reasons previously given. Neither would we agree with Brochard, whose solution of the difficulty is on the whole the most logical, i.e., that Aenesidemus had necessarily already passed through two phases of philosophical belief. It is possible to admit a gradual evolution of thought in Aenesidemus without supposing in either case a change of basis. His withdrawal from the Academy is an argument against, rather than in favor of a change on his part, and was caused by the well-known change in the attitude of the Academy.

Many of the teachings of the Sceptical School were taken directly from the Academy, belonging to those doctrines advocated in the Academy before the eclectic dogmatic tendency introduced by Antiochus. In fact, Sextus himself claims a close relation between the Middle Academy and Pyrrhonism.[1] Aenesidemus, although he was a Sceptic, belonged to the Academy, and on leaving it became, as it were, a pioneer in Pyrrhonism, and cannot be judged in the same way as we should judge a Sceptic of Sextus' time.

It seems a self-evident fact that during the two centuries which elapsed between the time of Aenesidemus and Sextus, the standpoint of judgment in the Sceptical School had greatly changed. An example illustrating this change we find in a comparison of the presentation of Scepticism by Diogenes with that of Sextus. The author Whom Diogenes follows, probably one of the Sceptical writers, considers Xenophanes, Zeno, and Democritus, Sceptics, and also Plato,[2] while Sextus, in regard to all of these men, opposes the idea that they were Sceptics.[3] Diogenes also calls Heraclitus a Sceptic, and even Homer,[4] and quotes sceptical sayings from the Seven Wise Men;[5] he includes in the list of Sceptics, Archilochus, Euripides, Empedocles, and Hippocrates,[6] and, furthermore, says that Theodosius, probably one of the younger Sceptics, objected to the name 'Pyrrhonean' on the ground that Pyrrho was not the first Sceptic.[7]

[1] Hyp. I. 232.

[2] Diog. IX. 11, 17-72.

[3] Hyp. I. 213-214; I. 223-225.

[4] Diog. IX. 11, 71.

[5] Diog. IX. 11, 71.

[6] Diog. IX. 11, 71-73.

[7] Diog. IX. 11. 70.

We have given the testimony from many sources to the effect that before the time of Sextus the Empirical School of Medicine was considered identical with Scepticism, although not so by Sextus himself. From all of these things we may infer a narrowing of the limits of Pyrrhonism in the time of Sextus.

Let us accept with Brochard the development of thought seen in Aenesidemus from the beginning to the end of his career, without agreeing with him that Aenesidemus ever consciously changed his basis. He was a Sceptic in the Academy. He left the Academy on that account, and he remained a Sceptic to the end, in so far as a man can be a Sceptic, and take the positive stand that Aenesidemus did.

Two things might account for his apparent dogmatism-

(i) The eclectic spirit of his time.

(ii) The psychological effect upon himself of this careful systemisation of the Sceptical teachings.

Let us consider the first of these causes. Aenesidemus, although not the first of the later Sceptics, was apparently the first to separate himself from the Academy. He was the founder of a new movement, the attempt to revive the older Scepticism as taught by Pyrrho and Timon, and separate it from the dogmatic teachings of the Stoics which were so greatly affecting the Scepticism of the New Academy. It was the spirit of his time to seek to sustain all philosophical teaching by the authority of as many as possible of the older philosophers, and he could hardly escape the tendency which his training in the Academy had unconsciously given him. Therefore we find him trying to prove that the philosophy of Heraclitus follows from Scepticism. It is not necessary either to explain the matter, as both Hirzel and Natorp so ingeniously attempt to do, by claiming that the truth of contradictory predicates which Aenesidemus accepted from Heraclitus referred only to phenomena. The history of philosophy gives us abundant proof of the impossibility of absolute Scepticism, and Aenesidemus furnishes us with one example of many of this impossibility, and of the dogmatism that must exist in connection with all thought. In the case of Aenesidemus, who evidently gave the best efforts of his life to establish the Sceptical School, the dogmatism was probably unconscious. That he remained to the end a Sceptic is shown by the fact that he was known as such to posterity. Nowhere do we find a change of basis referred to in regard to him, and Sextus, in refuting the mistakes which he attributes to Aenesidemus, does it, as it were, to point out something of which Aenesidemus had been unconscious.

Let us consider here the second cause of Aenesidemus' Dogmatism, the psychological effect upon himself of formulating Sceptical beliefs. The work that he did for the Sceptical School was a positive one. It occupied years of his life, and stamped itself upon his mental development. In formulating Scepticism, and in advocating it against the many enemies of the School, and amidst all the excitement of the disruption from the Academy, and of establishing a new School, it was inevitable that his mind should take a dogmatic tendency. He remained a Sceptic as he had always been, but must have grown dogmatic in his attitude towards the Sceptical formulae, and was thus able to adopt some of the teachings of Heraclitus, unconscious of their inconsistency.

Where should we find a modern writer who is consistent in all his statements? Could we read the works of Aenesidemus, we might better understand the connection between the apparently contradictory ideas in his teaching, but the inconsistencies in statement would probably remain. It is necessary to remember the position of Aenesidemus in breaking away from the Academy and in founding a new school, the full significance of which he could not foresee. There must necessarily be some crudeness in pioneer work, and some failure to see the bearing of all its parts, and a compiler like Sextus could point out the inconsistencies which the two centuries since the time of Aenesidemus had made plain. Aenesidemus was too positive a character to admit of absolute Sceptical consistency. He was nevertheless the greatest thinker the Sceptical School had known since the age of Pyrrho, its founder. In claiming a union between Pyrrhonism and the philosophy of Heraclitus, he recognised also the pre-Socratic tendency of the Sceptical School. The name of Socrates was all powerful in the Academy, but Aenesidemus comprehended the fact that the true spirit of Pyrrhonism was of earlier origin than the Academic Scepsis.

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