PLATE 4 



EXPLANATION OP FIGURES 



7 and 8 Parts of a normal pulpa-like spleen. Eleventh day of incubation. 

 Figure 7 shows newly formed sinuses wdth particularly numerous lymphoid 

 hemocytoblasts inside. Figure 8 shows a part of the spleen with definitely 

 formed veinous capillaries and well developed granulopoiesis between the vessels. 



"9 Ingrowth of arterial capillaries into the pulpa-like spleen. Thirteenth 

 day of incubation. 



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