64 NORMAL HISTOLOGY. 



cells, scarcely visible, and note the protoplasm, nuclei, and nucleoli, 

 also the cell-wall. View a cell on edge. Is it perfectly flat? Find a 

 group of cells and notice how they are joined together. Search for 

 small spherical bodies. These are the salivary corpuscles, and are in 

 reality escaped lymphoid cells from the adenoid tissue at the root of 

 the tongue. 



Place upon the slide some of the scrapings from the pharynx (upper 

 part) of a frog. Examine with H. P. and observe the elongated cells 

 with cilia in motion. Ciliated cells may also be demonstrated from 

 scrapings of the macerated trachea of a pig or ox. 



Examine the scrapings of the stomach of some animal. Observe the 

 columnar cells. Scrape the cut surface of a liver with a scalpel and 

 mix the scrapings with normal saline. Examine and search for hepatic 

 cells, representing glandular epithelium. 



Epithelium of a frog. Macerate the larva of a frog or salamander in 

 dilute alcohol, cut the casts from, the skin into small pieces, and apply 

 one of these to a slide and stain with haematoxylin, method No. 5. 



MEMORANDA. 



