302 STUDIES IN ADVANCED PHYSIOLOGY. 



first, that containing much lymphatic tissue, it gives rise to 

 white corpuscles; second, that the splenic pulp is no doubt 

 largely instrumental in removing from the blood passing 

 through it degenerate red corpuscles. 



The fact that the spleen may be removed without seri- 

 ous injury to an animal may be explained on the ground 

 that there are many lymphatic glands in the body able to 

 produce white corpuscles, and that the destruction of the 

 red corpuscles naturally done by the spleen might be as- 

 sumed by the liver, in which, regularly, a wholesale destruc- 

 tion takes place. 



3. TJie adrenal bodies. Situated immediately above 

 each kidney there is a small glandular mass called the ad- 

 renal body, or not infrequently, the supra-renal body. The 

 right and left adrenals do not have the same form, but are 

 about the same in bulk. They measure from one to two 

 inches from above downward, and from about one inch 

 to an inch and a half from side to side. Their thickness is 

 only about one-fifth of an inch. From these dimensions it 

 will be seen that they are by no means tiny structures, and 

 from their size and the richness of their vascular supply 

 one might suspect that they play an important role in the 



Fig. 123. SECTION THROUGH THE SUPRA-RENAL BODY. (After Allen Thomson.) 

 _ r, kidney; w, supra-renal vein; the distinction between cortex and medulla is also 

 shown. 



body. Each adrenal body is covered with a capsule of con- 

 nective tissue through which is visible the somewhat yellow- . 

 ish or brownish yellow gland. The gland itself is composed 



