IN RELATION TO ZOOLOGICAL DISTINCTION. 



31 



The differences between carnivora, herbivora, etc., have already been 

 noticed, and if now we compare certain of the members of different classes 

 it will be seen, for instance, that there is a marked difference between the 

 dog 1 : 13.5 (7.4 per cent) and the cat 1 : 15.4 (6.5 per cent) ; between the 

 bullock 1 : 13 (7.7 per cent), the sheep 1 : 12.5 (8 per cent), the goat 1 : 16.1 

 (6.2 per cent), and the horse 1 : 10.3 (9.7 per cent); between the rabbit 

 1 : 16 (6.2 per cent), the guinea-pig 1 : 16.7 (6 per cent), and the mouse 

 1 : 12.3 (8.1 per cent), etc. These differences are certainly of sufficient defi- 

 niteness to be suggestive of importance. 



TABLE 7. Proportion of blood to body-weight in different animals, according 



to various observers. 



Welcker's investigations (Prager Vierteljahressch. f. d. prakt. Heilk., 

 1854, iv, 63; Zeit. f. rat. Medicin, Ser. 3, 1858, iv, 147) are of especial value 

 because of the number and variety of the species and orders represented 



