XXVIII.] SUPRARENAL CAPSULE. 31$ 



is the zona reticularis. In the medulla the cells are often irregular 

 or polygonal with a clearer protoplasm, which is often tinged of a 

 yellowish or brownish colour. There are numerous vessels and 

 nerves, the latter with ganglionic cells. 



Harden the suprarenal capsules of a guinea-pig in Klein's fluid 

 (5-7 days), and then in alcohol, or fix in Flemming's fluid. Harden 

 a human suprarenal in Kleinenberg's fluid (24 hours), and then in 

 alcohol. Make radial sections, and stain some in hsematoxylin, and 

 others in picro-carmine. Or stain and cut in paraffin. 



12. V.S. Suprarenal Capsule. (L) Observe the arrangement 

 already described. It is to be noted, however, that there are great 

 variations in the structure of these organs in different species of 

 animals. 



(|-|) Examine the cells in the various zones (fig. 305). 



ADDITIONAL EXERCISE. 



Termination of Nerves in Suprarenal Capsules. The literature and most 

 recent results will be found in Fusari's paper 1 (with a plate). He used 

 capsules of the mouse, rabbit, pig, cat, and new-born infant. The method 

 employed was the quick method of Gdlgi (Lesson XXX.), i.e., small fresh pieces 

 are placed in the osniico-biehromate fluid (3-10 days), and afterwards in I per 

 cent, silver nitrate solution (1-2 days). 



LESSON XXIX. 

 SKIN AND EPIDERMAL APPENDAGES. 



THE SKIN. 



THE skin consists of the epidermis and cutis vera, dermis, or 

 corium. The epidermis consists of many layers of stratified 

 squamous epithelium (p. 317). The corium is composed of a basis 

 of fibrous connective tissue white and yellow fibres and its sur- 

 face is thrown into a number of papillae, which differ in size, 

 number, arrangement, and form in different parts of the body. 

 Undivided conical elevations are called simple p<tpill<r, but when 

 these are beset with smaller papillae, they are called Htnt/tnun'f 

 papilla'. The epidermis completely covers in the apices of the 



1 Ardiivitttl. tie 7'/W., xvi. p. 262, 1891. 



