36 LABORATORY METHODS OF 



Collect upon the tongue some saliva and place it 

 on the slide; cover and examine with H. P. Do you 

 see any blood vessels? Are the cells all of the same 

 shape? What figure would be the nearest to their 

 shape? What have you concluded as to the manner 

 in which they get their nourishment? Do they re- 

 semble scales? If so, they are of the squamous va- 

 riety. There are four varieties and it is our purpose to 

 study them in detail. These cells are reproduced by 

 mitosis. Give the function of this variety of cells. 



Exercise No. 21. 



1. Place upon the slide some scrapings from the 

 upper part of the pharynx of a frog. 



2. Examine with H. P. Note the following: shape, 

 cilia, contents and size of nucleus. The functions of 

 the cilia is to give motion to substances passing over 

 them. This variety is columnar in shape, at the same 

 time ciliated. 



Exercise No. 22. 



Examine the scraping from the stomach of some 

 animal and note the shape of the cells there. This is 

 done in 1 the same manner as the others. You will find 

 that the cells are of a columnar variety. 



