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 1 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 (6). 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). 



ft. In the sub-mucous tissue, serous and 

 mucous racemose glands. 



1 Cp. footnote on p. 257. 



