154 J. M. D. OLMSTED 
or less hexagonal cells inclosed by them. In other cases there 
were no evidences whatever of taste buds. In all respects is 
this similar to what was found in Amiurus. 
SUMMARY 
1. Taste buds disappear from the fungiform papillae on the 
anterior part of the dog’s tongue as a result of cutting the lingual 
nerve. 
2. Taste buds disappear only on the side of the tongue corre- 
sponding to the severed nerve, those on the other side remaining 
in perfect order. 
3. The process by which the taste buds disappear is one of 
degeneration with the aid of phagocytic leucocytes, and not one 
of dedifferentiation or metamorphosis. 
4, Epithelial cells take the place of the former taste buds and 
during this process there is marked proliferation by mitosis from 
the germinative layer. 
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