THE EARLY HISTORY OF THE OLFACTORY 

 NERVE IN SWINE.' 



By Edgar A. Bedford, S. M. 



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 ob- 

 servations 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 superseded.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 



1 Contribution from the Zoological Laboratory of Northwestern University, 

 William A. Locy Director. 



^ Max Schultze. Untersuchungen iiber den Bau der Nasenschleimhaut. 

 Adhandhingen der Naturjorschenden Gesellschaft zu Halle, Bd. VII, 1862. 



