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282 and spent his whole time (save that considerable portion which was devoted to abusing Challenger for not getting us out of our difficulties) in cleaning and mounting his specimens.

Challenger had been in the habit of walking off by himself every morning and returning from time to time with looks of portentous solemnity, as one who bears the full weight of a great enterprise upon his shoulders. One day, palm branch in hand, and his crowd of adoring devotees behind him, he led us down to his hidden work-shop and took us into the secret of his plans.

The place was a small clearing in the centre of a palm grove. In this was one of those boiling mud geysers which I have already described. Around its edge were scattered a number of leathern thongs cut from iguanodon hide, and a large collapsed membrane which proved to be the dried and scraped stomach of one of the great fish lizards from the lake. This huge sack had been sewn up at one end and only a small orifice left at the other. Into this opening several bamboo canes had been inserted and the other ends of these canes were in contact with conical clay funnels which collected the gas bubbling up through the mud of the geyser. Soon the flaccid organ began to slowly expand and show such a tendency to upward movements that Challenger fastened the cords which held it to the trunks of the surrounding trees. In half an hour a good-sized gas-bag had been formed,