1 82 



Journal of Comparative Neurology. 



they finally enter and since only one process was ever observed 

 and that on the side toward the brain, he concludes that some 

 of the neuroblasts have migrated into the nerve and finally 

 reach the brain (Fig. 2). 



t)rain capsule 



olfactory 

 pit. 



Fig. J. After Disse. 



His found cells which he described as bipolar in the devel- 

 oping nerve and on this account thought that the term olfactory 

 ganglion was more appropriate than olfactory nerve. 



The main points claimed by Disse are : ist, confirming 

 previous investigators that the olfactory nerve develops from 

 neuroblasts in the olfactory epithelium ; 2nd, That a part of 

 the neuroblasts wander into the olfactory nerve and pass event- 

 ually into the brain but remain unipolar ; 3rd, He considers the 

 olfactory nerve as embryonic in character with cells of origin 

 remaining in the olfactory epithelium. The fibers are non-med- 

 ullated and in these respects quite different from the cranial 

 nerves. 



