ON MATTEB AND FORCE. 61 



Measured by the carbon it contains, tyrosine is 

 a higher product of albumen than leucine, uric 

 acid, or urea. 



Whether it, or some other product from 

 albumen in the blood or in the kidney, gives 

 rise to uric acid, has to be determined. 



Certain it is that our chemical knowledge 

 now entirely does away with all idea of any 

 want of vital action, causing excess of urates in 

 the urine, and a very slight advance will 

 probably enable us to prepare uric acid in the 

 laboratory from the albuminous substances. 



The progress of animal chemistry proves 

 more and more clearly that the matter in the 

 body has no special chemical properties peculiar 

 to life ; but that matter within possesses the 

 same chemical energy which it possesses out of 

 the body. 



Life has no power to create or to destroy 

 any chemical force in the matter of living 

 things ; but the very slightest difference in the 

 circumstances under which any chemical action 

 occurs, produces a variation in the effects that 

 are produced. 



Ultimately, when all the circumstances 

 under which vital chemical actions occur are 



