customed to sleep in the daytime, and they could not understand how it came about that they had all slept for fully two hours. They had yet to learn that one of the results of "camping out," or living in the open air, is an ability to sleep at almost any time. All animals and wild creatures, whether they are beasts or savages, have this happy faculty of sleeping in the daytime. It is one of the habits of our savage ancestors that comes back to us when we abandon civilization, and live as Aryan tribes, from whom we are descended, lived in the Far East, before they marched with their wives and children and cattle from India, and made themselves new homes in Europe.
After lunch the boys prepared to start, although there was still no wind; but when they went down to the boat they found that the sun was as hot as ever. So they returned to the shade of the grove, and made up their minds to stay there until the end of the afternoon.
"Harry," said Tom, "we've been on the river
