214 CIRCULATING FLUIDS: 



veins contained so small a quantity of blood that Professor Gurlt 

 was unable to collect from them more than about 50 grains. 



The blood obtained in this manner was visibly darker than 

 the aortic blood. I stirred it for a considerable time with a 

 rod, but could obtain no fibrin ; on leaving it to stand, it became 

 gelatinous, and resembled the blood of the hepatic vein after 

 similar treatment. 



Mic7'oscopic analysis. Upon comparing the two sorts of 

 blood under the microscope, the only perceptible differences 

 were the following : In the unmixed blood of the renal veins 

 the corpuscles united themselves into islets and amorphous 

 groups, in which the individual globules could not be traced. 

 Upon mixing some of this blood with a solution of salt, a 

 larger quantity of small and middle-sized corpuscles were ob- 

 served than in the aortic blood when similarly treated. The 

 proportion, however, of the small corpuscles to the large ones 

 was not so striking as in the blood of the hepatic vein. (Vide 

 supra, p. 209.) 



In consequence of the small quantity of material, I resolved 

 to determine only the most important of the constituents. I 

 made an accurate estimate of the proportions of water and 

 albumen, but was prevented by illness from ascertaining the 

 quantities of globulin and hsematin. 



1000 parts of blood contained : 



From these analyses it appears that the blood of the renal 

 veins is more abundant in solid constituents and in albumen 

 than the aortic blood, but that it contains less fibrin and fewer 

 blood-corpuscles. 



The two latter inferences, respecting the quantity of fibrin 

 and of blood-corpuscles in the blood of the renal vein, cannot 

 be drawn from the analyses in the same certain manner as in 

 the comparative analyses of the blood of the hepatic vein and 

 of the vena porta). 



