900 ERRORS OF LIEBIG. 



the various secretions, and the vital activity of all 

 the functions. (See book iv. ch. ii. and ch. iv.) 



I have further shewn from the experiments of 

 Macaire, Marcet, and Michaelis, that venous con- 

 tains more carbon and hydrogen than arterial 

 blood, consequently, that they must unite with 

 atmospheric oxygen while passing through the 

 lungs, where caloric is obtained, with an excess 

 of oxygen and nitrogen. If any additional proof 

 of this were required, it is afforded by the analyses 

 of Mulder, (quoted by Dr. Pereira from the Phar- 

 maceutisches Central. Blat.fiir. 1837, s. 325,) who 

 found that fibrin from venous blood of the cow, 

 contains more carbon and hydrogen than that of 

 arterial blood, as will be seen from the following 

 results, to which I have added those of Michaelis, 

 obtained by heating the dry coagulum, fibrin, 

 and albumen of blood from the calf, with oxide of 

 copper. 



Venous Arterial Venous Arterial 

 blood. blood. jibrin. Jibrin. 



Carbon.... 52-107* .. 51-921 .. 53-476 .. 53-019 



Hydrogen.. 7-766 .. 7-533 .. 6-952 .. 6-828 



Nitrogen .. 16-700 .. 16-800 .. 15-295 .. 15-462 



Oxygen .. 23-405 .. 23-744 .. 24-281 .. 24-691 



But in the total absence of these experiments, 

 which Liebig has overlooked, the combination of 



* The average of all the results of Michaelis, as quoted by 

 Miiller, are exhibited in the above table. (Muller's Elements, p. 

 323.) 



