Principles of Part V; 



fophy have been fo much advanced during 

 thefe two laft ages. Medicine has attained 

 its prefent perfection only from the hiftory 

 of difeafes and cafes delivered down. Chy- 

 miftry is now reduced to a regular fyftem, 

 by the means of experiments made either 

 by chance or defign. But where are the 

 experiments in agriculture to anfwer this 

 purpofe ? When I look round for fuch, I 

 can find few or none *. There, then, lies 

 the impediment in the way of agriculture. 

 Books in that art we are not deficient in; 

 but the book which we want is a book 

 of experiments. 



AND, indeed, as things ft and at prefent, 

 it muft always be fo. Mankind are my in 

 attempting any thing, or at leaft render- 



* Since thefe papers were wrote, I have read three 

 volumes of experiments publifhed by Du Hamel^ on 

 Tw/Ps fyftem of agriculture. They are diftinct, exact, 

 conclufive, fo far as they have gone, and ftand a model 

 for experiments in agriculture. What a fhame for 

 Great-Britain^ where agriculture is fo much cultivated, 

 and where that fyftem took its rife, to leave its exact 

 value to be determined by foreigners ! 



ing 



