LESSON XV. 



SALIVARY GLANDS AND PANCREAS. 

 SALIVA. 



A. Mucous SALIVARY GLAND. 



1. Prepare sections of a dog's submaxillary gland 

 which has been placed in 75 p. c. alcohol for an 

 hour and then in absolute alcohol. Stain the 

 sections with carmine (best dilute) or hoema- 

 toxylin, and mount them in glycerine. 



Under a low power observe 



a. The division of the section into irregular 

 angular areas, by connective-tissue septa, 

 which, if the section includes the circum- 

 ference, will be seen to proceed from the 

 sheath of the gland. These are the primary 

 lobules; they may be seen to be divided 

 into smaller lobules, but probably not dis- 

 tinctly. 



b. The alveoli, appearing as small roundish 

 bodies closely aggregated together to form 

 the lobules; each will be seen to consist of 



