Figures 357-365. — Cells of the thrombocyte series found in bone marrow. Figures 357, 363, 364, and 

 365 from the adult bird and 358-362 from 6-day-old chick. 2,470 X. 



357, 358 Thromboblasts. A nucleolus is present in each characteristic of thrombocytes at this age but may 



but is faint because masked by chromatin gran- represent an earty disintegration reaction, 



ules, which are dense. 363 Mid-immature thrombocyte. 



359-362 Early immature thromljocytes. The lighter 364 Late immature thrombocyte, 



perijjheral cytosomal margin as in figure 362 is 365 Mature thrombocyte. 



186 



