THE BLOOD OF EQUINES. 253 



The differential counts obtained for equines are summarised in 

 the following table: — 



Lynipho- Mono- Neutro- Eosino- Baso- 

 Adult Horses. cytes. cytes. philes. pbiles. philes. 



Extreme variations ... ... 25-50 0-9 34-62 1-15 0-3 



Average variations 30-45 2-8 45-60 3-9 0-3 



(a) Average for "stabled" 



horses 36 4 54 5 1 



(b) Average for " fast- 

 working " horses ... 40 5 50' 4 1 



(c) Average for " other " 



horses 39 4 52 4 1 



Average for groups (a), 



(b) and (c) 38 4 53 4 1 



Adult mules, average ... 41 3 49 6 1 



Adult donkeys, average 53 4 31 8 1 



From this table it is seen that the differential count of the 

 leucocytes is not influenced by work, as the averages for the 

 horses in the three groups agree very closely. There is a marked 

 difference between horses and donkeys, however, the figures for 

 the neutrophiles and lymphocytes in the latter being practically 

 the reverse of those in the former. Moreover, the donkey has an 

 exceptionally high eosinophile count. 



The differential count of the leucocytes of mules is approxi- 

 mately the sanie as that of horses. 



In nuinerous experiments it was found impossible to 

 influence the propox'tions of the various cells, excepting in the 

 case of the eosinophiles. These cells were always increased in 

 jugular blood when the animal was given a drink of water after 

 a period of thirst. This eosinophilia is very transient, and dis- 

 appears again in a few houi's. 



Mares just before and after foaling, and foals just after birtli. 

 showed a neutrophilia, that is, an increase in neutrophiles, in 

 some instances up to 80 per cent. This, however, provided the 

 animals remained healthy, had completely disappeared in two 

 months. 



Summary. 



1. Erythrocyte counts of healthy horse blood are much in- 



creased by regular fast work. 



2. Diurnal variations in erythrocyte count of horse blood are 



due to mechanical changes in the circulation influencing 

 the distribution of the cells. 



3. Leucocyte count is not influenced by regular exercises, but 



during exercise the count increases for jugular blood. 

 ■4. In taking blood by puncture, the technique is all important 



and, by varying this, widely different data may be 



obtained. 

 5. Comparative data for the blood of horses, donkeys and mules 



are offered. 



