1894.] 



MICROSCOPICAL JOURNAL. 



143 



layers and are different in different levels. The cells 

 nearest the surface are very long and slender in vertical 

 sections ; if, in any part of the section, a surface view of 

 these cells is given, they are there seen to be broad, these 

 cells are destitute of any living granular protoplasm, 

 though the shape of the nucleus is retained in the cen- 

 tre. Cells similar to these can be had by mounting a lit- 



mis. 



/dermis 



mllll\llli iiiH' ■'■ri.i ..X ■--- 



sir 



Vertical section of the cesophagus, with high-power view of the epidermis, 

 gland, and muscular tissue. 



tie saliva, in which they are found, having been scraped 

 off the surface of the cheeks. Below the outermost lay- 

 ers the cells are not so greatly flattened though still con- 

 siderably elongate and some slight traces of granular par- 

 ticles are visible internally, still lower the cells are 

 rounded and their nucleus and cell-protoplasm are evi- 

 dently alive, finally at the bottom of the layers is a sin- 



