REPORT ON ANIMAL PHYSIOLOGY. 125 



In cold-blooded animals it is the quantity of cruor, not of 

 fibrin, which is diminished*. 



Michaelis gives the following analysis of the components of 

 arterial and venous blood into the elementary gases t- 



Albumen. 



Arterial. Venous. 



Nitrogen 15-562 



Carbonic acid 53-009 



Hydrogen 6-993 



Oxygen 24-436 



15-505 



52-652 



7-359 



24-484 



Nitrogen 17-587 



Carbonic acid 51-374 



Hydrogen 7-254 



Oxygen 23-785 



Fibrin. 



Arterial. Venous. 



17-267 



50-440 



8-288 



24-065 



Colouring Matter. 



Arterial. Venous. 



Nitrogen 17-253 I 17-392 



Carbonic acid 51-382 53-231 



Hydrogen 8-354 7-711 



Oxygen 23-011 | 21-666 



Arterial blood contains more niti'Ogen and oxygen, but less 

 carbonic acid and hydrogen, than venous blood. 



Nit. C. Ac. Hyd. Oxyg. 



Arterial blood 16-800 I 51-920 I 7-534 I 23-746 



Venous blood 16-720 | 52-107 | 7-765 | 23-408 



Lecanu has made some interesting comparative analyses of the 

 blood of individuals of diiferent ages, sexes, and temperaments. 

 To determine the proportion of the essential principles, he dried 

 a portion of the serum after having weighed it, and thus deter- 

 mined its water, its extractive matter, and salts. He then divided 

 the clot into two portions, dried one of them ; to determine, by 

 the loss, the quantity of water of the serum involved in it : and 

 washed the other, to obtain the quantity of fibrin. By the first 

 part of the process he ascertained that part of the weight due to 

 the extractive matter and salts left by the water of the serum 

 evaporated: subducting this he had the weight of fibrin and 

 colouring matter. By the second part of it he ascertained the 

 weight of the fibrin alone. The difference was the weight of the 

 colouring matter. In this way, examining the blood of twenty 

 healthy persons, ten males and ten females, he found the water 

 to vary in 1000 parts of blood— 



• Miiller. f Poggendorf, Annalen, 1832. 



