2O6 



BLOOD AND BLOOD-FORMING ORGANS. 



teased preparations, long, spindle-shaped and flat cells, which are 

 probably derivatives of the connective-tissue cells of the pulp and of 

 the endothelium and muscular fibers of the vessels. 





'J. 



Fig. 165. Cells containing pigment, blood-corpuscles, and hemic masses from the 

 spleen of dog; X 1800 (from cover-glass of H. F. Miiller). 



Fig. 1 66. From the human spleen ; X 80 (chrome-silver method) : a, Larger fibers 

 of a Malpighian body ; b, reticular fibrils (Gitterfasern). 



In embryonic life and under certain conditions in postembryonic 

 life (after severe hemorrhage and in certain diseases) red blood-cells 

 are developed in the spleen pulp. The nucleated red blood-cells 



