430 



COMPARATIVE PHYSIOLOGY. 



The fact that the spleen-pulp does not agree in composition 

 with either blood or serum ; that it abounds in extractives such 



Pio. 321.— Vertical section of a small superficial portion of human spleen, seen with 

 low power (Schafer). A^ peritoneal and fibrous covering; b, trabeculffi; c, c, Mal- 

 pighian corpuscles, in one of which an artery is seen cut transversely, in the other, 

 longitudinally; rf, injected arterial twigs; e, spleen-pulp. 



as lactic, butyric, formic, and acetic acids, together with inosit, 

 xanthin, hypoxanthin, leucin and uric acid — points to its being 



PiB. 328.— Thin section of spleen-pulp, highly magnified, showing mode of origin of 

 a small vein in the interstices of pulp (Scnafer). v, vein filled with blood-corpus- 

 cles, which are in continuity with others, 61, filling up mterstices of retif orm tissue 

 of pulp; w, wall of vein. The shaded bodies among red corpuscles are pale cor- 

 puscles. 



