The sense of smell is probably the least valued of the five senses, and the rôle it plays in many of the important bodily functions is least appreciated by the human race. Among the lower animals it is more essential, for by this sense they find and select their food, as well as detect the approach of danger. Some of the savage, or so-called wild people, have this faculty as highly developed as the lower animals, and Humboldt tells us of some Peruvian Indians who could follow the scent of game as well as hunting dogs.
These facts, though interesting, do not come within the scope of this article, and, in order properly to discuss the influence of the olfactories on digestion, we should study this subject from an anatomic, a physiologic, and a psychic standpoint. It may be well to remind the reader briefly that the area of the