With fourteen figures in the text.
From 1862, the time of the first examination, from the standpoint of modern science, of the structure of the olfactory nerve by MAX SCHULTZE,~ up to the present time, various observations have been made upon the structure and development of the olfactory nerve.
Some of the views held by older investigators have been superseded. There has been a growing tendency to depart from the earlier belief, that the olfactory nerve arises from the brain, to a belief that it originates in the periphery. This view is in harmony with the teachings of HIS that all sensory fibers originate in the periphery.
However, since this nerve differs, in some respects, in histological structure from other nerves, too much dependence must not be placed upon analogies drawn from the development of other nerves. Our views concerning the development of this nerve, therefore, must be based upon the observations regarding its individual development.
The anatomists of the middle of the 19th century looked upon the olfactory nerve as part of the brain, confusing it with the olfactory tractus and bulbus. Gradually this view began to be controverted and evidence was brought to show that both the optic and olfactory are true cranial nerves, although very