Chapter 6 No.6

Vegetative affinity, 66 et seq.

Vertebrates, regeneration of lost parts, 47.

Voechting, experiments on grafting, 70;

harmonic and disharmonic union, 70;

on cells, 114, 116;

on plasticity of plants, 117, 119;

on grafting, 120.

W

Weismann and preformation, 8-10;

caution against experiment, 12;

sources of his theory, 20, 21;

Hertwig's description of his theory, 22;

absence of proof for differentiating division, 34;

symmetry of egg and adult, 55;

immortality of germ-cells, 17, 80, 82;

germ-tracks, 83;

doubling division, 102;

controversy with Spencer, 125.

Willow, reproduction from slips, 46.

Wilson, separation of segmentation spheres of amphioxus egg, 60.

Wolff, Theoria Generationis, 4.

Wounds, healing of, in relation to idioplasm, xii.

Y

Yolk, nutritive material stored in an egg-cell, xvi.

THE END.

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