162 CIRCULATING FLUIDS: 



My analyses of tlie blood are even more confirmatory than 

 any of the preceding statements, of the production of these 

 substances during the active metamorphosis of the corpuscles. 



I analysed the blood of the aorta and vena renalis of one 

 animal, and the blood of the vena portarum and vena hepatica 

 of another animal, with the following results :^ 



Here we observe that the arterial blood contains more water 

 than the blood of the renal vein, and that the blood of the 

 vena portarum contains more than that of the vena hepatica ; 

 the arterial blood and the blood of the vena portarum contain 

 a larger amount of fibrin than the blood from the renal and 

 hepatic veins respectively. The blood of the renal vein con- 

 tains more albumen and fewer blood-corpuscles than arterial 

 blood, and a similar relation holds good between the blood of 

 the hepatic vein and of the vena portarum. Passing over all 

 other points of difi'erence, the results at which we have abeady 

 arrived afford an a jjriori argument for, and a confirmation of, 

 my theory respecting the formation of urea, uric acid, and bile, 



' In the first anah'sis, the venous blood from both the renal veins was collected. 

 The amount, although small, was sufficient for the required purpose. Professor Gurlt, 

 of our veterinary school, had the kindness to obtain the blood for me. 



^ The whole amount of blood from l)Oth renal veins did not exceed sixteen grains, 

 a quantity not sufficiently large to admit of the determination of the fibrin by wliip- 

 piug. I employed it in determining the ratio of the albumen to the dried residue, 

 and found that while the aortic blood contained 43, the blood of the renal veins con- 

 tained A.A-11 of albumen. 



