168 



THE ESSENTIALS OF HISTOLOGY. 



FlG. 198. A CARDIAC GLAND OF 

 DIMPLE FORM, FROM THE BAT's 



STOMACH. (Osmic acid prepara- 

 tion. ) ( Langley . ) 

 c, columnar epithelium of the sur- 

 face ; n, neck of the gland with 

 central and parietal-cells ; /, base 

 or fundus, occupied only by 

 principal or central cells, which 

 exhibit the granules accumulated 

 towards the lumen of the gland. 



FIG. 197. A CARDIAC GLAND FROM THE DOG'S STOMACH. (Highly magnified.) (Klein.) 



d, duct or mouth of the gland ; b, base or fundus of one of its tubules. On the right the base 



of a tubule more highly magnified ; c, central cell ; p, parietal cell. 





