Chapter 16 THE WORLD BEFORE THE FLOOD.

We made another attempt at walking on the deck--the moon was trying to struggle through the fog, which was now of a bright copper colour.

"Doctor," said I, "have you ever seen a yellow fog before?"

"Yes," he said, "I have seen a white, black, red, and yellow fog," and went off into a disquisition about optics, mediums, reflections, refraction