GO VARIATIONS IX NUMBER OF RED CORPUSCLES 



before the increased volume is noticeable. With small animals 

 the restoration of the red corpuscles is more rapid, three to four 

 weeks, while in the larger animals a longer time is required, 19-34 

 days (Lyon). The rapidity of the loss of blood has a marked effect 

 on the rate of restoration to the normal, recovery being slower 

 after rapid than after slow bleeding. Several hemorrhages though 

 smaller in amount than from a single one greatly delay restoration 

 and produce a more severe form of anemia. The rapidity of resto- 

 ration depends on the state of nutrition of the animal. It has been 

 found that recovery is hastened by a full diet, an abundant supply 

 of water and is more rapid with transfusion of salt solution. The 

 following table taken from Ewing shows that the amount of blood 

 that may be lost without a fatal result varies greatly in different 

 individuals and species. 



Table XX. — Limits of Hemorrhage from which Recovery Has Been 



Observed (Ewing) 



An anemia sometimes of extreme grade is produced by parasites, 

 especially those that live on blood. Strongylus in the respiratory 

 and digestive tracts, Uncinaria, Trichocephalus and related round 

 worms, trematodes in the liver and Cytodites in fowls are ex- 

 amples. In cases of anemia from parasites it may well be thai be- 



