VI ADVERTISEMENT. 



not always made references to such doctrines as are 

 become current, the authors of which are well known j 

 and which may be almost considered as the property 

 of all enlightened minds. 



Amongst books to which I have not referred for 

 any particular facts, but which contain much useful 

 general information, I shall mention the Earl of Dun- 

 donald's Treatise on the connection of Chemistry with 

 Agriculture ; Mr. Rennie's Dissertations on Peat ; and 

 the General Report of the Agriculture of Scotland. 

 This last work did not come into my hands till the 

 concluding sheets of these Lectures were printing. 

 Had it been in circulation before, I should have profit* 

 ed by many statements given in it, particularly those 

 of the opinions of the enlightened Professor of Agri- 

 culture in the University of Edinburgh; and I should 

 have dwelt with satisfaction on the importance given 

 to some chemical doctrines by his experience. 



Berkeley Square^ 

 Marcb^l 1813. 



