282 PRACTICAL HISTOLOGY. 



covered and examined. In the portion obtained from 

 near the anterior nares ordinary, columnar, ciliated 

 epithelium cells will be seen. In that form the true 

 olfactory part the cells, although many of them are 

 destitute of cilia, and in addition to the columnar, 

 elements spindle-shaped (olfactory) cells are met with 

 which are provided with a bunch of stiff-looking, 

 hair-like processes, resembling the similar appen- 

 dages of the auditory epithelium. 



THE GUSTATORY ORGANS. 



For studying the taste-buds, the foliated papillae 

 which are found on either side of the base of the 

 rabbit's tongue are used. To obtain them the tongue 

 is cut out entire from the recently-killed animal, 

 when the little .oval patches marked with transverse 

 ridges may readily be found (Fig. 32, p, p). They 



Fig. 32. 



\ 

 P 



Tongue of rabbit, seen from above. 

 p, p, Papillae folialse. 



are snipped off with curved scissors, and one is 

 dropped into a mixture of equal parts of spirit and 

 one-half per cent, of chromic acid, and the other is 

 placed in one per cent, of osmic acid. After two 

 days the spirit and chromic mixture is to be ex- 

 changed for strong spirit, and in twenty-four hours 

 more, the piece of tissue may be embedded so as to 

 cut sections, which should be as thin as possible, 

 vertical to the surface of the mucous membrane, 



