a 



J 



J 



k 



m 



n 



Figure 88.- 



r 5 



-Outlines of normal thrombocytes and their nuclei, showing variability in shape, and in 

 number and size of granules. 2,470 X. 



a-g One specific granule per cell. Size of granules ranges 

 from small to large. Cell g tending toward a re- 

 active thrombocyte. 



h-k Two specific granules per cell. 

 1-0 Three specific granules per cell, 

 p-s Four or more specific granules per cell. 



of the cell. When the specific granules are ab- 

 sent or are liidden by the nucleus, the throm- 

 bocyte becomes a difficult cell to identify. Fork- 

 ner (1929) observed that thrombocytes have a 

 clear cytoplasm at first but during the progress of 

 staining with neutral red and janus green, vacu- 

 oles developed at one or both ends of the nuclei. 

 These stained a muddy, brown color, were non- 



refractile, and increased in size with long ex- 

 posure. If the cells are elongated, like those in 

 figures 73 and 88, k, m, and q, they could pass 

 for poorly developed erythrocytes; on the other 

 hand, if rounded like figures 88 g, i, and s, they 

 would simulate lymphocytes. Usually the nu- 

 cleus is smaller than that of the lymphocyte. 

 The nucleus of figure 80 is an exception and is 



43 



