repeated "Really! Really!" in the pitying tone one would use to a child. Indeed, they are children both—the one wizened and cantankerous, the other formidable and overbearing, yet each with a brain which has put him in the front rank of his scientific age. Brain, character, soul—only as one sees more of life does one understand how distinct is each.
The very next day we did actually make our start upon this remarkable expedition. We found that all our possessions fitted very easily into the two canoes, and we divided our personnel, six in each, taking the obvious precaution in the interests of peace of putting one Professor into each canoe. Personally, I was with Challenger, who was in a beatific humour, moving about as one in a silent ecstasy and beaming benevolence from every feature. I have had some experience of him in other moods, however, and shall be the less surprised when the thunderstorms suddenly come up amidst the sunshine. If it is impossible to be at your ease, it is equally impossible to be dull in his company, for one is always in a state of half-tremulous doubt as to what sudden turn his formidable temper may take.
For two days we made our way up a good-sized river, some hundreds of yards broad, and dark in colour, but transparent, so that one could usually see the bottom. The affluents of the Amazon are, half of them, of this nature, while the other
