IN RELATION TO ZOOLOGICAL DISTINCTION. 



39 



carnivora the percentages of Na are almost identical, but in the horse, pig, 

 and rabbit they are distinctly lower. The quantity of K in the blood of 

 the ruminants is about 60 per cent higher than in carnivora, and in the horse, 

 pig, and rabbit about 10 times higher than in carnivora. It is of interest 

 to note that, while the quantities in the bullock, sheep, and goat are prac- 

 tically identical (mean, 0.400), and also in the dog and cat (mean, 0.257), 

 they differ in the horse (2.738), pig (2.309), and rabbit (2.108) so distinctly 

 as to indicate generic distinctions. 



TABLE 13. The percentages and ratios of Na and K in the bloods, sera, and 

 corpuscles of different animals. 



In contrast with the foregoing, while we do not find such differentia- 

 tions in the percentages of either Na or K in the sera, in the corpuscles 

 they are even far more striking than those which have been noted in the 

 whole blood. Bunge (Zeit. f. Biologie, 1876, xn, 191), in his analyses of 

 the bloods of the bullock, horse, and pig, recorded the interesting fact that, 

 while Na is present in the corpuscles of the bullock in the proportion of 

 over 2 parts per 1,000, it is entirely absent from the corpuscles of the horse 

 and pig. The subsequent researches of Wanach (Inaug. Dissert. St. Peters- 

 burg, 1888; Maly's Jahr. u. d. Fort. d. Thierchemie, 1888, 88) and Botazzi 

 and Capelli (Atti della R. accad. dei Lincei, 1899, Serie V, vm, 65; Maly's 

 Jahr. u. d. Fort. d. Thierchemie, 1899, 176), and Abderhalden (Zeit. f. 

 physiolog. Chemie, 1898, xxv, 67) have accentuated the importance of this 

 observation. From a study of the records of these investigators it is evi- 

 dent that the representatives of the different genera, etc., fall into four 

 distinct groups (1) dog and cat; (2) bullock, sheep, and goat; (3) man; 



