PLATE 2 



EXPLANATION OF FIGURES 



6 Lymphoid hemocj^toblast arising in the mesenchyme separating the testis 

 from the Wolffian body in the tenth-day embryo. 



7 Granidopoietic focus in the loose mesenchyme of the testis of the embryo 

 of the eighteenth day of incubation. Several stages in the formation of granu- 

 locytes occur ardund two arteries. In one of the latter a large endothelial cell 

 is arising. /, histiotopic wandering cells; p, pigmentary cell; t, transitional 

 stages between the granulocytoblasts, m, and the granulocytes, g. Delaf . hem. eos. 



8 Extravascular hemocytoblast prior to the deposition of acidophile gran- 

 ules. Same stain as preceding. 



9 to 12 Several stages in the dei)osition of acidophile granules in the cytoplasm 

 of hemocytoblasts. 



13 Three young hemocytoblasts in contact with a blood-vessel. Mesenchyme 

 separating the Wolffian body from the dorsal body wall. 



14 Large granulocytoblasts with swollen acidophile granules. Degenerat- 

 ing ovary of the eighteenth-day embryo. Delaf. hem. eos. 



15 Hematopoietic focus in the ventral surface of the Wolffian body. Embryo 

 of the eighteenth day of incubation, t', dwarf hemocytoblast changing into a 

 small lymphocyte. Delaf. hem. eos. 



110 



