SANGUIFICATION. 633 



represented by those of Prevost and Dumas. 

 For on, evaporating a mixture of arterial and 

 venous blood of healthy pigeons to perfect dry- 

 ness, by means of a moderate temperature, pro- 

 duced by a water bath, as in the process of Pre- 

 vost and Dumas, Mr. Marshall obtained 20-41 

 per cent, of solid particles. There is also reason 

 to believe, from the analyses of Denis, that the 

 blood of the more active mammalia when in health 

 and well nourished, is more highly organized 

 than that of man. For with Prevost, Dumas, 

 and Le Canu, he found the latter to average about 

 13 per cent. ; while the blood of the dog, calf, 

 bullock, and horse, afforded the mean of 16.40 

 per cent, of fibrin and hsematozin; as might be 

 inferred from the size of their lungs, mean tem- 

 perature, and power of digestion, which I have 

 shown to be greater than in man, ceteris paribus.* 

 In accordance with the above facts, Denis found 

 the proportion of fibrin in the mixture of arterial 

 and venous blood of the fowl, to be 12 parts in 

 1000 ; while in venous blood of the horse, it varied 

 from 5 to 6, and in that of man, from 2*9 to 4*3. 



* Denis also found the blood of individuals with broad chests 

 and great muscular power, to contain from 14 to 18 per cent, of 

 fibrin and red particles ; whereas in those of narrow chests, and 

 feeble constitutions, they varied from 8 to 1 1 per cent. And as 

 might be supposed from the larger size of the thorax in man than 

 woman, his blood is richer in organic particles, in the ratio of 13-24 

 to 11 '59, according to M. Le Canu. (Etudes Chimiques sur le 

 sang humain, par Louis Rene Le Canu.) Coinciding with these 



