204 EXPLANATION OF THE PLATES. 



FIG. VII. Portion of the shaft of a hair.], Epidermis; 

 2, cortical substance ; 3, medullary canal filled with cells. 



[PLATE XXV. 



HAIES, continued. MUCOUS MEMBEANE OF THE ALIMENTAEY 



CANAL. 



FIG. I. Cortical substance of a hair subjected to the 

 action of caustic potash. It is seen to be made up of fusiform 

 bodies, the result, apparently, of metamorphosis of the nuclei of 

 epidermic cells. 



FIG. II. Hair follicle magnified 200 diam. 1, External 

 layer ; 2, internal layer, and 3, amorphous limitary border of 

 the involuted portion of true skin forming the follicle ; 4, exter- 

 nal epidermic layer, corresponding to the corpus mucosum of 

 Malpighi ; 5, internal epidermic layer, corresponding to the 

 external or horny layer of the epidermis ; 6, bulb ; 7, vascular 

 papilla ; 8, medullary substance. 



FIG. II. One of the papillae circumvallatse of the tongue 

 magnified 25 diam. 1, Section of the principal papilla sur- 

 mounted by secondary papillae, 2 ; 3, epithelium, presenting a 

 smooth surface. 



FIG. IV. A filiform papilla magnified 25 diam. 1, Body 

 of the papilla, surmounted by secondary papillae, 2 ; 3, epithe- 

 lium presenting also secondary papillae, 4. 



FIG. V. A lenticular papilla magnified 50 diam. 

 1, Central orifice leading into a cul-de-sac ; around this the 

 capillaries of the mucous membrane are shown. 



FIG. VI. Epithelium of the O3sophagus. 1, Two of its 

 cells, detached. 



FIG. VII. Surface of the mucous membrane of the 

 stomach magnified 25 diam. 1, Orifice of a gastric gland. 



FIG. VIII. Compound pyloric gland of an infant magni- 

 fied 250 diam. 1, 1, Its two terminal cul-de-sacs opening into 

 a common outlet. 



