In very hot climates, where the heat of the sun has great power, people are usually as brown as mahogany; and in the hottest countries they are negroes, with black skins. A learned man once travelled into one of these warm climates, from the cold regions of the north, and thought he would roam about as he did at home; but he soon had to change his opinion. He found that, like all sensible people, he must remain in the house during the whole day, with every window and door closed, so that it looked as if all in the house were asleep or absent. The houses of the narrow street in which he lived were so lofty that the sun shone upon them from morning till evening, and it became quite unbearable. This learned man from the cold regions was young as well as clever; but it seemed to him as if he were sitting in an oven, and he became quite exhausted and weak, and grew so thin that his shadow shrivelled up, and became much smaller than it had been at home.