PLATE II 



VARIETIES OF LEUCOCYTES 



a. Polymorphonuclear Neutrophiles. Note the varieties in size and shape 

 of granules, the regular staining of the nuclei, the light space around them, 

 their relatively central position in the cell. 



b. Myelocytes. Note the identity of granules with those just described; the 

 even, pale stain of nuclei, their position near the surface (edge) of the cell. The 

 two cells figured indicate the usual variations in size of the whole cell. 



c. Small Lymphocytes. In the cell at the left note the transparent proto- 

 plasm ; in the cell next to it note the very pale pink of protoplasm around the 

 nucleus which is deeply stained, especially at the periphery. The next cell 

 has an indented nucleus; its protoplasm relatively distinct. The cell on the 

 extreme right shows no protoplasm and is probably necrotic. In all note 

 absence of granules with this stain. With basic stains a blue network appears 

 in the protoplasm. 



d. Large Lymphocytes. Note the pale stain of nuclei and protoplasm, 

 regularity of outline; indented nucleus in one. Every intermediate stage 

 between these and the "small" lymphocytes occurs, and the distinction be- 

 tween them is arbitrary. 



e. Eosinophile. Note regular shape, loose connection of granules, their 

 copper color, their uniform and relatively large size, and spherical shape. 



/. Eosinophilic Myelocyte. Note similarity to the ordinary myelocytes b, 

 except as regards granules. Colors of granules may be, as in e, ordinary 

 eosinophile. 



All the above were stained with the Ehrlich triacid stain, and drawn with 

 camera lucida. Oil immersion objective ^ and ocular No. iii. of Leitz. 

 (Cabot.) 



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