226 JOHN SUNDWALL 



failed to reveal prozymogen granules as described by Bensley 

 for the pancreas. 



Vital staining with methylin blue showed the sympathetic 

 nerve fibres of the gland, as demonstrated by Dogiel. The 

 granules are not stained. 



XIII. SUMMARY 



1. The lachrymal gland in Bovidae is made up of two parts — 

 a Pars superior which comprises b}^ far the greater bulk of the 

 gland and an auricular appendage which extends downwards 

 between the Bulbus oculi and the outer bony orbital wall — the 

 Pars inferior. 



2. The gland is composed of a series of from six to eight com- 

 pound tubular glands serially arranged and in close apposition 

 to each other. Each gland may be subdivided, beginning with 

 the terminal opening and proceeding to the secretory elements, 

 into the following structures: main duct, primary duct, inter- 

 lobular duct, intralobular duct, intercalary duct, tubule or 

 alveolus. 



3. Elastic fibres are abundant in the capsule and in the larger 

 interlobular septa. They appear to some extent in the more 

 prominent intralobular septa but in the finer they are not seen. 

 These fibres do not surround the individual secreting tubules 

 as claimed by Boll, Schirmer, Fumagalli, and others, in various 

 animals. Lymph cell infiltrations of the septa are not normal 

 conditions though so held by Schirmer for this gland in man 

 and by Fleischer in the ox. The basement membrane is formed 

 by a reticular connective tissue similar to that seen in the sali- 

 vary gland. In addition to this membrane, irregular, anasto- 

 mosing connective tissue cells are seen between and surrounding 

 the tubules together with plasma cells, endothelial cells, and 

 lymph cells. While smooth muscle cells are frequently seen 

 occurring singly in the capsule and in the largest interlobular 

 septa, they are not found within the lobule surrounding the 

 individual tubules as held by Kollosow, Zimmermann and others. 



4. The epithehal cells of the main duct are irregular in outline 

 and arranged in several layers. Numerous goblet cells are seen. 



