THE BLOOD OF EQUIXES. 



•241 



10 millions. The average figures obtained for the various chisses 

 of horses are given in Graph 1 as percentage volumes of red 

 corpuscles in the blood. In the horse there is a constant ratio 

 between the percentage volume of the red cells and their 

 number. If the percentage volume of the erythrocytes be divided 

 by 4-35, the figure so obtained is the erythrocyte count in millions. 

 Conversely, the erythrocyte count in millions, multiplied by 4'35 

 gives the percentage volume of the red cells in the blood. 



Graph I. 



Graph II. 



50r 



U-O 



30- 



20 



TTl 



'/ 



// 



/ 



50 



40 



iO 



20L 



y/A 



B 



C 



A — Average for Stablert Horses. 



B — Average for Medium Horses. 



C — Average for Fast-working Horses. 



D — Average for Race Horses 



(in full training). 



A — Mare (untamed and 



untrained). 



B — Daughter of Seclusion 



(Riding Mare), 



C. — Greentop (in full 



training). 



Percentage Volumes of Eed Corpuscles in the Blood of 

 Various Classes of Horses. 



So far all the work had been done upon nondescript animals, 

 most of which were intended for horse-siCkness experiments. To 

 exclude the possibility of " breed " being an important and 

 deciding factor in the production of the blood picture, three i*aee- 

 horses from the same stable, but in different stages of training, 

 were examined. The figures are given in Graph II, and con- 

 firmed the already conclusive evidence obtained previously. 



Three young racehorses were then kept under observation 

 for five weeks during their period of hard training. Even in so 

 short a time as this a marked increase in erythrocyte count was 

 noted, as shown in Graph III. 



