Histogenesis of the Blood Platelets. 277 



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EXPLANATION OF FIGURES 



The water color drawings were made by the author with the aid of a camera 

 lucida. They are all drawn at the same magnification, except fig. 6, which ia 

 drawn with a 3mm. Zeiss apochromatic oil-immersion objective, while the others 

 are drawn with a 2 mm. objective of the same kind. The eye-piece used in all 

 cases was compensating ocular 6. With the exception of figs. 18 to 21 all the 

 figures were drawn from sections either of the bone marrow or spleen of the cat or 

 kitten. 



Fig. 1. Megakaryocyte in position of amoeboid activity with its protoplasm 

 projecting far into the lumen of a blood vessel in the form of pseudpods. Blood 

 platelets free and in process of segmentation from the pseudopods. Vacuoles 

 in cytoplasm and in platelets. 



Figs. 2-4. Megakaryocytes which have lost nearly all of their cytoplasm and 

 present more or less degenerate nuclei. Platelets are shown free and in process 

 of budding off from the cytoplasm. Vacuoles in cytoplasm and platelets. 



Fig. 5. Megakaryocyte showing excessive development of pseudopods wdth 

 blood platelets developing from them. 



Fig. 6. Megakaryocyte with its cytoplasm prolonged into a blood channel in 

 the form of a very long pseudopod. The continuity of the different portions of 



