IN RELATION TO ZOOLOGICAL DISTINCTION. 



41 



THE PHOSPHORIC ACID OF THE ASH OF THE CORPUSCLES IN 

 RELATION TO GENERA. 



Abderhalden (loc. cit.) has shown that the proportions of P2O 5 in the 

 ash of the serum of the bloods of the cat, dog, bullock, sheep, goat, horse, 

 pig, and rabbit are nearly the same, while in the corpuscles they are so 

 different as to show not only class but generic distinctions. 



The proportions of P20 5 in the sera of these animals range within the 

 narrow limits of 0.0197 and 0.025 per cent (table 14). In the corpuscles 

 the minimum and maximum are 0.699 and 2.244. The percentages in the 

 different animals differ in such ways as to give rise to the same differentia- 

 tion as was noted with the Na and K salts. 



TABLE 14. The percentages and ratios of P 2 5 in the ash of the bloods, 

 sera, and corpuscles of different animals. 



Taking again the dog and cat as the basis of comparison, the ratio of 

 P 2 O 5 in serum to corpuscles is 1 : 6.6 (mean) ; that of the ruminants 1 : 2.93 

 (mean) ; that of the horse 1 : 7.9, of the pig 1 : 10.4, and of the rabbit 

 1 : 9.2. These differences cause the different animals to fall into the same 

 groups as determined by the Na and K content of blood and corpuscles. 

 This is certainly a striking parallelism. 



THE PROPORTIONS OF CHOLESTERIN IN THE SERUM AND CORPUSCLES IN 



RELATION TO GENERA. 



The proportions of cholesterin, according to Abderhalden's analyses 

 (loc. cit.), vary within a much wider range in the sera and to even a greater 

 extent in the corpuscles than P 2 O 5 . Here again the same well-defined 

 distinctions are noticeable, and not only in the whole bloods and in the 

 corpuscles, but also in the sera (table 15). 



Comparing the bloods of the three groups (taking the mean percent- 

 age of the carnivora as being 0.1002), the mean percentage of cholesterin in 

 the ruminants is distinctly higher (0.1639), while in the horse, pig, and 

 rabbit it is the reverse, being less than half as much (0.047). In the sera 

 and corpuscles specific differences will be noted, the cholesterin content 

 being highest in the ruminants, lower in the carnivora, still lower in the 

 rabbit, and lowest in the horse and pig. The percentage in the corpuscles 

 of all species is higher than in the sera, and the differences are least marked 



