PLATE II 



VARIETIES OF LEUCOCYTES 



a. Polymorphonuclear Neutrophiles. Note the varieties in size and shape of gran- 

 ules, 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 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 net- 

 work 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 between 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 6, except as 

 regards granules. Color 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.) 



