120 GLANDS. 



placed on a slide of glass, covered by a thin slip, and then examined 

 under the microscope." Or, to render the object transparent, scrap- 

 ings are put into a test-tube with about half an ounce of water, to 

 which three drops of pure sulphuric acid are added, and the whole 

 boiled for one or two minutes. " If too much acid be used, it will 

 dissolve all the minute vessels and capillaries, but not the Malpighian 

 coil, or tuft. This is worthy of notice, as showing a great difference 

 in the chemical constitution, and consequently in the organization, 

 of these different parts." 



The addition of chloroform, under similar circumstances, also has 

 the effect of rendering objects transparent. " I have succeeded in 

 exhibiting the tubes of the kidney very distinctly, by boiling small 

 pieces of the organ in diluted chloroform, and also in solution of 

 chlorate of potassa, which latter is useful in giving a clear view of 

 the surface of the kidney when congested, as it shows the venous 

 plexus and the tubes, and acts but slowly upon the blood-globules." 

 To show the vessels in connexion with the Malpighian bodies, and 

 at the same time to exhibit the tubes : after injecting the vessels 

 with white lead finely ground in oil (artists' tubes), and well agitated 

 with sulphuric ether, small pieces of the organ were boiled in very 

 diluted chloroform, and some thin sections were made with Valen- 

 tin's knife ; other sections were first dried, then immersed in spirits 

 of turpentine, and finally placed on a glass slide, in a drop of water, 

 under the microscope. " Muriatic, acetic, and nitric acids, also ex- 

 hibit the tubuli with considerable distinctness; the last, however, is 

 apt to discolor the tubes. I have also tried the effect of many other 

 chemical reagents; among others, the phosphoric, chromic, boracic, 

 tartaric, and citric acids, the alkalies and their carbonates, various 

 salts, etc." 



In conclusion, I must again urge the student who wishes to fully 

 comprehend the anatomy of the kidney, to consult this admirable 

 paper, and study its graphic illustrations ; it is the ablest anatomical 

 monograph that our country has as yet produced, and a fit contribu- 

 tion, by its lamented author, to the science to which he devoted his 

 life.] (Ed.) 



Testicle. Testicle. The proper coat of the testicle (tunica 

 albuginea) is of the same structure as that of the 



