TO 



THE BRITISH ASSOCIATION 



FOR THE 



ADVANCEMENT OF SCIENCE. 



At the meeting of the British Association in 

 Glasgow, in 1840, I had the honour to present the 

 first part of a report on the then present state of 

 Organic Chemistry, in which I endeavoured to de- 

 velope the doctrines of this science in their bearing 

 on Agriculture and Physiology. 



It affords me now much gratification to be able 

 to communicate to the meeting of the Association 

 for the present year the second part of my labours ; 

 in which I have attempted to trace the application 

 of Organic Chemistry to Animal Physiology and 

 Pathology. 



In the present work an extensive series of phe- 

 nomena have been treated in their chemical rela- 

 tions ; and although it would be presumptuous to 

 consider the questions here raised as being definitely 

 resolved, yet those who are familiar with chemistrv 



