ABSTRACT
On ascending from the lowest types of life, in which the adjustment of inner to outer relations is thus limited, one of the aspects under which heightening correspondence shows itself, is the increasing distance at which coexistences and sequences in the environment can produce adapted changes in the organism. This progress takes place simultaneously with the development of the senses of smell, sight, and hearing; and ultimately of the higher faculties. The sense of smell is very obviously one which implies the contact of dispersed particles with a specially-modified part of the organism—is a sense which becomes operative, only when these particles are so carried by a current of air or water as to impinge upon this modified part. The sense of hearing is one by which we feel the vibrations of the air lying in contact with our bodies.
