Morrill, Innervation of Olfactory Epithelium. 



I8I 



terest on this account. He found, with the Golgi method, in 

 the olfactory pit of the third day chick neuroblasts with taper- 

 ing processes pointing toward the central portion of the epithe- 

 lium but found no trace of a nerve. Supporting cells were 

 found between the neuroblasts (Fig. i). This had been ob- 

 served by His and others. 



--^~. supporting cells. 



neuroblasf 



Fig, I. After Disse. 



At the fifth day the nerve processes from the neuroblasts 

 were found to have extended quite a distance from the epithe- 

 lium toward the brain but had not reached it. During the sixth 

 day the fibers were found penetrating the outer portion of the 

 brain which was still free from cells and the processes easily fol- 

 lowed as had been previously observed (Fig. 3). 



^ 



gangliOTi cell- 



brain. 



flfeers of olfactory ner?'e. 



Fig. 2. After Disse. 



The ganglion cells found quite early in the developing ol- 

 factory nerve between the fibers and considered by His as bi- 

 polar Disse claims to be unipolar and since he finds them first 

 in that part near the olfactory epithelium and of the same shape 

 as the neuroblasts and later finds them nearer the brain which 



