EPITHELIUM OF THE OLFACTORY REGION. 



205 



tions of the olfactory nerves, which come out with remarkable 

 distinctness in specimens prepared with chloride of gold. 



The superficial layer of the olfactory mucous membrane is an 

 epithelium which in specimens prepared with chloride of gold 

 (as is shown in fig. 337) is divisible into two, an external, which 



Fig. 339. 



Fig. 339. A group of olfac- 

 tory cells from the Proteus, 

 with an epithelial cell lying 

 within them. From a speci- 

 men prepared with Miiller's 

 fluid, a. An isolated olfac- 

 tory cell, after treatment with 

 a diluted solution of sulphuric 

 acid. 



Fig. 340. 



Fig. 340. A a, Epithelial cells from 

 the olfactory region of the Proteus (from 

 a specimen prepared with Miiller's fluid) ; 

 d, the processes apparently connected 

 with them ; c, olfactory cells. -B, Epithe- 

 lial and olfactory cells from Man ; after 

 Max Schultze. 



is finely striated transversely, and an internal granular layer. 

 It was formerly considered to be a laminated epithelial layer. 

 Eckhardt and Ecker to some extent indicated its nature cor- 

 rectly, but we are indebted to the beautiful researches of Max 

 Schultze for. the full details of its structure. From these it 



