334 



ELEMENTS OF HISTOLOGY. [Chap. XLTI. 



different tint, being more of a brownish colour; it 

 contains the ramifications of the olfactory nerve, and 

 is the seat of tit e organ of smell. 



490. The free surface is covered with a columnar 



Pig. 165. From a Section through the Olfactory Region of the 



Guinea-pig. 



a. Thick olfactory epithelium; 6, thin olfactory epithelium; c. Ciliated non- 

 olfactory epithelium; rf, hone. The transverse sections or the olfactory 

 nerve bundles and the tubular glands of Bowman are well seen. (Atlas.) 



epithelium, composed of the following kinds of cells 

 (Fig. 166): 



(a) A. superficial layer of long columnar, or rather 



