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. (6) Blood platelets. 



(c) Polymorphonuclear leucocyte with eosinophilic rods, (d) Polymor- 

 phonuclear leucocyte with eosinophilic granules, (e.e) Lymphocytes 

 (small and large). (/) Large mononuclear cell, (g) Mast cell. ^-^xv^-o-/? 



FIG. 2. Leukaemic blood of the fowl. Wilson's stain. Zeiss objective 

 1/12, eye-piece No. 3. Composite picture, (a) Normal normocytes. (&) 

 Normocytes showing anisocytosis, poikilocytosis, polychromatophilia, with 

 swelling of nucleus and separation of its chromatin. (c) Normoblast. 



(d) Megaloblast. (e) Mitoses of erythrocytes, all stages from monaster 

 to complete division of nucleus. (/) Blood platelets; both cell and nucleus 

 increased in size; increase in size with two nuclei, (g) Polymorphonu- 

 clear leucocyte with eosinophilic rods. (7i) Polymorphonuclear leucocyte 

 with eosinophilic granules, (i) Lymphocyte. (;') Large mononuclear 

 cell; same size and larger than normal with both nucleus and cytoplasm 

 paler, (fc) Mitoses of large mononuclear cell; all stages, from monaster 

 to complete separation of nucleus. (I) Mast cell, (m) Mononuclear 

 myelocyte with eosinophilic granules. () Cytoplasmatic masses without 

 nuclei. 



