DESCRIPTION OF PLATE I. 
Fig. 1—Normal blood of the fowl. Wilson’s stain. Zeiss objective 1/12, 
eye-piece No. 3. Composite picture. (a) Normocytes. (b) Blood platelets. 
(c) Polymorphonuclear leucocyte with eosinophilic rods. (d@) Polymor- 
phonuclear leucocyte with eosinophilic granules. (¢.é) Lymphocytes 
(small and large). (f) Large mononuclear cell. (g) Mast cell. 
Fig. 2.—Leukemic blood of the fowl. Wilson’s stain. Zeiss objective 
1/12, eye-piece No. 8. Composite picture. (a) Normal normocytes. (b) 
Normocytes showing anisocytosis, poikilocytosis, polychromatophilia, with 
swelling of nucleus and separation of its chromatin. (c) Normoblast. 
(d) Megaloblast. (¢) Mitoses of erythrocytes, all stages from monaster 
to complete division of nucleus. (jf) Blood platelets; both cell and nucleus 
increased in size; increase in size with two nuclei. (g) Polymorphonu- 
clear leucocyte with eosinophilic rods. (h) Polymorphonuclear leucocyte 
with eosinophilic granules. (i) Lymphocyte. (j) Large mononuclear 
cell; same size and larger than normal with both nucleus and cytoplasm 
paler. (k) Mitoses of large mononuclear cell; all stages, from monaster 
to complete separation of nucleus. (1) Mast cell. (m) Mononuclear 
myelocyte with eosinophilic granules. (n) Cytoplasmatic masses without 
nuclei. 
