XXVIIl] TONGUE. NOSE 217 



short neck running to the free surface of the epidermis 

 of the fossa, where its circular open mouth may often 

 be seen. The epidermic cells are flattened around its 

 median portion, forming a nest for it. 



The external or cover-cells of the taste-bud, 

 curved and flattened, with conspicuous oval nuclei. 



The internal taste-cells, each with spherical or 

 ovoid nucleus, thin peripheral and still thinner central 

 process. 



Nerve fibres running along the dermis of the 

 papillae, and branching off to the buds. 



2. Longitudinal section of tip of tongue of kitten 

 (Flemming's fluid). Stain with picrocarmine. Observe 



The filiform papillae of the dorsal surface. If 

 fungiform papillae are also present, note the taste-buds 

 in them. 



The absence of papillae from the ventral surface of 

 the tongue. 



The bundles of striated muscular fibres, vertical, 

 horizontal and transverse. 



The small racemose glands. 



B. NASAL Mucous MEMBRANE. 



1. Transverse section of nose of newt (Flemming's 

 fluid ; picrocarmine). "Observe (1. p.) 



The nasal chamber on either side surrounded by 

 bony and cartilaginous plates and lined by an epithelial 

 layer, thick, except in its lateral part. 



The glands and the cut bundles of nerve fibres 

 below the mucous membrane. 



