THE METABOLISM OF THE BODY. 437 
tion of the splenic pulp; for a ferruginous proteid, and numer- 
ous pigments, of a character such as harmonizes with this con- 
ception, are found. 
The fact that the spleen-pulp does not agree in composition 
with either blood or serum; that it abounds in extractives such 
Vigne 
S3 nee 
We 
Fig. 331.—Thin section of spleen-pulp, highly magnified, showing mode of origin of a small 
vein in the interstices of pulp (Se fer). , vein filled with blood-corpuscles, which are in 
continuity with others, bl, filling up interstices of retiform tissue of pulp; w, wall of 
vein. The shaded bodies among red corpuscles are pale corpuscles. 
as lactic, butyric, formic, and acetic acids, together with inosit, 
xanthin, hypoxanthin, leucin and uric acid—points to its being 
3 
3 
| 
Fic. 332.—Portion of spleen of cat, showing Malpighian (lymphatic) corpuscle (after Cadiat). 
A, artery around which corpuscle is placed ; B, meshes of spleen-pulp, injected ; C, artery 
of corpuscle ramifying in lymphatic tissue. The clear space around corpuscle represents 
a lymphatic sinus. 
the seat of a complex metabolism, though neither the changes 
themselves nor their purpose are well understood. 
Nevertheless, it must be admitted that to recognize this was 
a great advance upon the view that the spleen had no impor- 
