258 ELEMENTARY PHYSIOLOGY. [XXV. 



cal nucleus, its hyaline slender peripheral, and 

 its still more slender varicose and branching 

 central process. 



c. Cylindrical cells will frequently be seen, sur- 

 rounded and partially hidden by three, four 

 or more rod-cells. 



2. Take the nose of a freshly-killed newt' as in § 1, 

 but instead of laying bare the olfactory chambers, 

 cut off the tip of the nose. Place it in chromic 

 acid '3 p.c. for a week. If the salts of the bone 

 are not completely .dissolved, complete the 

 solution with nitric acid 1 p.c. mixed with an 

 equal volume of spirit. Imbed it vertically, and 

 cut transverse sections. Stain and mount one 

 of the first sections (a) and one of the last 

 sections (&). Observe 



a. In the respiratory portion of the mucous 

 membrane 



a. That the surface- epithelium consists of 

 columnar ciliated cells, interspersed with 

 goblet-cells. Between the deeper por- 

 tions of these cells and close to the base- 

 ment membrane, some small cells will 

 be seen (these with or without division 

 develop into the surface cells). 



/S. In the sub-mucous tissue, serous and 

 mucous racemose glands. 



1 Cp. footnote on p. 257. 



