140 



DIGESTION. 



part in the process of secretion ; since Pfliiger has found that in sec- 

 tions of the gland, examined immediately after being taken out of the 



Fig. 36. 



GLANDULAR FOLLICLES AND CELLS; from the subm axillary gland of the dog. 



(Heidenhain.) 



body, transparent drops of fluid may be seen exuding from the ends of 

 the cylindrical epithelium cells into the cavity of the duct. The follicles 



Fig. 37. 



SECTION OF THE SUBMAXILLARY GLAND FROM THE DOG. a. Salivary duct, 

 with cylindrical epithelium and central cavity. 6. Follicle, with glandular epithelium and 

 central cavity. (Kolliker.) 



and lobules are surrounded with a delicate layer of connective tissue, in 

 which are distributed the capillary bloodvessels, which supply to the 

 gland the materials for its secretion. 



