PLATE 5 



EXPLANATION OF FIGURES 



10 Part of a normal spleen, in which the follicle is adjacent to the pulpa. 



11 Infiltration of the spleen tissue with granulocytes and immigration of 

 granulocytes into the vessels. Z, immigration of a leucocj^te in the vessel. Eight 

 days after stimulation of an 8 day embryo. 



318 



