COMPARATIVE H^EMATOLOGY 375 



cells, about 20^; no definite granules can be observed. 

 The eosinophile cells contain large deeply staining 

 coccal-shaped granules. 



Mouse. The granules of the polymorphonuclear 

 leucocytes are usually not stained, or only very faintly 

 so. The nucleus of the eosinophile cell is ring-shaped 

 or much divided, and the granules are coccal and stain 

 oxyphile. The remarkable character of the blood is 

 the high percentage of large mononuclear cells. 



Rat. The fine rod-shaped granules of the poly- 

 morphonuclear leucocytes are usually very faintly 

 stained. The granules of eosinophile cells are well 

 stained and coccal-shaped, the nucleus is often ring 

 shaped. The basophile granular cells are few but the 

 granules are large, and stain deeply basophile. 



Guinea-pig. Polychromasia and punctate baso- 

 philia of red cells are very commonly observed 

 nucleated red cells are also frequent. The large mono- 

 nuclear cells often contain vacuoles " Kurlow cells" 

 possibly of a parasitic nature. 



Rabbit. It is not uncommon to find nucleated 

 red cells in films from quite healthy animals. The 

 granules of the polymorphonuclear leucocytes stain 

 oxyphile. The coarse granules of the eosinophile cells 

 appear to stain less deeply oxyphile, probably owing to 

 the basophile staining of the cytoplasm. 



Rhesus monkey. The blood cells resemble those 

 met with in human blood. The minute neutrophile 

 granules of the polymorphonuclear leucocytes are often 

 very scanty, and sometimes apparently absent. The 

 eosinophile cells are not so densely packed with coarse 

 oxpyhile granules as in the human eosinophile, and the 

 nuclei of these cells are usually much divided, or 

 polymorphous . 



Goat. The red cells are small, nonnucleated discs, 

 only about 4.5^ diameter, not much more than half 

 that of the human red cell. The polymorphonuclear 



