334 



ELEMENTS OF HISTOLOGY. [Chap. XLII. 



different tint, being more of a brownish colour ; it 

 contains the ramifications of the olfactory nerve, and 

 is the seat of the organ of smell. 



490. The free surface is covered with a columnar 



- c 



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

 Guinea-pig. 



tf. Thick olfactory epithelium; b, thin olfactory epithelium; c. ciliated non- 

 olfactory epithelium; rf, bone. The transverse sections of the olfactory 

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



epithelium, composed of the following kinds of cells 

 (Fig. 166):- 



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



