LESSON XXVI. 



THE DUCTLESS GLANDS. 



1. Section of thyroid of cat or other mammal. 

 (Flemming's fluid, imbedded, stained on the cover-slip 

 with hsematoxylin and acid magenta.) Note 



The separate roundish vesicles forming the gland ; 

 they vary much in size, and have very little connective 

 tissue between them. 



The epithelium of the vesicles, the cells are of 

 varying height, but usually somewhat flattened. 



The homogeneous colloid substance filling the 

 central space of the vesicles (the colloid is probably 

 stained deep red). 



In dehydrating the tissue, the colloid substance may shrink 

 irregularly from the cells, giving it a vacuolated appearance at 

 the periphery. 



2. Section of parathyroid of cat (treatment as thyroid in 

 1). Note the cells arranged in curved cylinders, or columns, 

 or roundish masses ; there are no vesicles like .those of the 

 thyroid and no colloid substance. 



3. Pituitary body of cat. (Flemming's fluid.) Transverse 

 sections of anterior and of posterior lobe cut separately, frozen 

 (the posterior lobe is apt to break into pieces and is perhaps 

 best imbedded). Stain with Ehrlich-Biondi fluid, or with borax- 

 methylene blue and eosin. 



Note in the anterior lobe the anastomosing cell-tubes, or 

 columns of cells ; the two forms of cells, viz. ovoid, deeply 



