William A. Hammond,
Fasting Girls: Their Physiology and Pathology
“ Looking at a bear, for instance, for the first time, and with no knowledge of its habits and capacities we would not be apt to believe that the animal could go into retirement at the beginning of winter and remain till spring in a condition of semi-existence and without food. But experience teaches us that the bear when it begins to hibernate is fat; that during hibernation it is in a perfectly quiescent state; that when it emerges into active life again it is emaciated, and that during the whole period of retirement it has taken nothing into its stomach. ”
