JOURNAL OF MICROSCOPICAL SCIENCE. 



EXPLANATION OF PLATE XIV, 



Illustrating Mr. E. Cresswell Baber's paper on the Lym- 

 phatics and Parenchyma of the Thyroid Gland of the Dog. 



Fig. 1. — From a transverse section of the thyroid gland, injected with 

 Berlin blue and stained wit,h picrocarininate ol ammonia (Ve- 

 rick'sObj. 6; Oc. 1). 



a. Lumen of au artery, seen in transverse section. 



b. Cross section of a large lymphatic vessel surrounding it. 



This is seen filled with a granular material stained 

 yellow in the specimen. The dark outline indicates the 

 position occupied by the Berlin-blue injection. 



e. Contents of the vesicles, presenting a similar appearaace 

 to b. 



d. Walls of the gland-vesicles, the epithelial cells of which 

 are flattened by the action of the reagents. 



Fig. 2. — Lymphatic tubes showing endothelium, from a transverse section 

 of the gland injected with silver. In this section, which is 

 thick, the tubes, which in the drawing appear on one level, are 

 situated on various planes, and frequently dip down among the 

 vesicles (Obj. 3 ; Oc. III). 



Fig. 3. — From a longitudinal section, showing several parenchymatous cells 

 (with unshrunken cell-substance) situate at various distances 

 from the interior of the vesicles {a a). Some are separated 

 from the cavity of the vesicle by merely a membrane (c), others 

 by flattened epithelial cells, and others again by normal epit helial 

 cells. Between a and « is a cavity, from which a parenchyma- 

 tous cell has probably escaped (Obj. 8 ; Oc. I). 



Fig. 4. — From a longitudinal section, showing three parenchymatous cells 

 (A) apparently situate in a common cavity. The wall of the neigh- 

 bouring vesicle has become flattened out, and the flattened 

 epithelial cells have separated, placing the parenchymatous cells 

 in free communication with the interior of the vesicle {a). 



