5i6 Veterinary Medicine. 



3d. The polynudear leucocytes are two or three times as large as 

 the red cells (horse 8 to 16^1). The reticulum takes basic stains, 

 many of the granules take neutrophile stains. In the horse, 50 

 to 69 per cent. 



4th. Eosinophile leucocytes vary in size from that of the lymph- 

 ocytes to that of the polynudear cells. Their granules stain 

 red in acid eosin solutions. In the horse, from 3 to 6 per cent. 



5th. Mast cells vary in size, are mononuclear or polynudear, 

 and contain granules that are strongly basophile — taking alka- 

 line stains. In the healthy horse these are from .1 to 2.8 per 

 cent. These are tissue cells and when in excess imply disease in 

 the bone marrow usually. 



THE BI,OOD PIvATES. 



These are the third great division of the formed elements in the 

 blood. They are circular or ovoid, colorless, homogenous, or 

 granular, non-nucleated, taking both acid and alkaline stains, 

 and varying from i to 3/* in diameter. They may be scanty in 

 fresh blood and increase by standing, so that they have been 

 looked upon as the debris of broken down globules and particu- 

 larly of liberated nuclei. In dry specimens, stained by methyline 

 blue, this origin from the red cells can be apparently demon- 

 strated. 



