364 LIQUID PARTS OF ANIMALS. 



The mucoso-extractive matter of Marcet, and the lactate of 

 soda of Berzelius, are two different names given to the same sub- 

 stance. 



The crassamentum yielded when incinerated an ash, which, 

 when 1000 parts were burnt, amounted to 15. Of this ash, 

 water dissolved three parts, consisting partly of carbonate of so- 

 da, and partly of phosphate of soda. The undissolved portion 

 consisted of, 



Peroxide of iron, . . 5 

 Perphosphate of iron, . 1 

 Bonearth, . . 1 



Pure lime, ... 2 

 Carbonic acid, . 1 



10 



The following table exhibits the salts which exist in human 

 blood, according to the latest statements of Lecanu ; though 

 he has nowhere, so far as I have observed, given a detail of the 

 method by which they were detected. 



1. Common salt. 8. Phosphate of soda. 



2. Chloride of potassium. 9. Phosphate of lime. 



3. Sal-ammoniac. 10. Phosphate of magnesia. 



4. Sulphate of potash. 11. Lactate of soda. 



5. Carbonate of soda. 12. Margarate and oleate of soda. 



6. Carbonate of lime. 13. A volatile fatty acid salt. 



7. Carbonate of magnesia. 



12. Having now stated the different substances which exist in 

 blood, with the exception of the gaseous bodies which have been 

 detected by various chemists, it may be proper, before proceed- 

 ing farther, to notice these gases as shortly as possible. The 

 gases found in blood are oxygen, azotic and carbonic acid. 



It was long ago shown by Hoffmann and Steevens that, when 

 venous blood is kept in the vacuum of an air-pump, carbonic 

 acid gas is given out. But, as succeeding experimenters did not 

 succeed on their trials, it was long generally admitted that ve- 

 nous blood contained no sensible quantity of carbonic acid gas, 

 and hence it was inferred that the carbonic acid gas in expired 

 air was formed in the lungs. The experiments of Magnus have 

 at last proved in the clearest manner that blood, both venous and 

 arterial, contains carbonic acid, oxygen, and azotic gases. * 



* Ann. de Chim. et de Phys, Ixv. 169. 



