10 THE BLOOD. 



Diameter. Diameter. 



Water rat, ^^ Opossum, ^ 5r 



Porcupine, W3 ^ Kangaroo, T ^ 



Beaver, ^-3- 



Guinea-pig, ^-g L. diam. S. diam. 



Rabbit, WOT Dromedary (oval), . 



Two-toed sloth, W&y Camel (oval), 



Birds. 



-Z?ej9^765. 



Corpuscles Oval. 



Long Short Long Short 



Diameter. Diameter. Diameter. Diameter. 



Green turtle, .... -^- T T - 8 Vj Lizard, -nfey y ^ 



Land tortoise, .... T^ ^^ Viper, .... 1^7-4 rfoy 



Amphibia. 



Corpuscles Oval. 



Long Short Long Short 



Diameter. Diameter. Diameter. Diameter. 



Frog, iiVs TS Vr Toad, 



-?7sAe5. 



Corpuscles Oval. 



Long Short Long Short 



Diameter. Diameter. Diameter. Diameter. 



Perch, ..... TTihrs irsV? Pike, ..... j(nnr "jseT 

 Carp, -2-j^y 7^- Eel, T^-J y-g^J 



Enumeration of the Blood- Corpuscles. In most of the quantitative analyses of the 

 blood, the proportion of moist corpuscles to the entire mass of blood is stated to be a 

 little less than one-half. This estimate is necessarily rather rough ; and it would be in- 

 teresting to ascertain, if possible, the normal variations in the proportion of corpuscles, 

 under different conditions of the system, particularly as these bodies play so important a 

 part in many of the functions of the organism. Actual enumerations of the blood-cor- 

 puscles have been made by Vierordt, Weckler, and others, and quite recently by Malas- 

 sez (1874). It is stated by Malassez that the error, in his calculations, does not amount to 

 more than two or three per cent. The process employed by Malassez is the following: 



