PLATE II 



VARIETIES OF LEUCOCYTES 



Plate II is reproduced by the kind permission of Dr. Cabot. It illustrates certain 

 typical varieties of leucocytes. All are stained with the Ehrlich triacid stain, and drawn 

 with camera lucida. Oil immersion objective ^ and ocular No. iii of Leitz. (Cabot.) 



1. Small Lymphocytes. In the cell at the left note the transparent protoplasm; 

 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. 



2. 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 between them is arbitrary. 



3. 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. 



. 4. 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. 



5. Eosinophile. Note regular shape, loose connection of granules, their copper 

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



6. Eosinophilic Myelocyte. Note similarity to the ordinary myelocytes b, except 

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



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