^-.^. 



yt^^ . ^-:^^<^^^>^^^^^^- 



o-' 



ON THE -^ 3 . V ^ 



SCIENCE OF AGRICULTURE : 



COMPRISING 



A COMMENTARY ON AND COMPARATIVE INVESTIGATION 



OF THE 



AGRICULTURAL CHEMISTRY 



OF 



MR. KIRWAN AND SIR HUMPHRY DAVY; 



THE 



CODE OF AGRICULTURE 



OF 



SIR JOHN SINCLAIR, SIR JOSEPH BANKS, AND OTHER 



AUTHORS ON THE SUBJECT. 



SHEWING, 



That there is not only a discrepance in the opinions of those Authors on many 

 of the most imtwrtant operations of Agriculture ; but that this arises from their 

 inferences and conclusions being erroneous ; and their principles unfounded, or 

 inapplicable ; and, particularly on the subject of breeding, and the nature, 

 preparation, and application of manures. And also of the rust or black blight in 

 wheat ; of which the true cause, and its preventive are here explained. 



DeBicateB to tlje 13riti0|) JPublic. 



By JOSEPH HAYWARD, 



AirTHOR or THE SCIENCE OF HORTICULTUKE. 



LONDON: 



PRINTED FOR 



LONGMAN, HURST, REES, ORME, BROWN, AND GREEN, 



PATERNOSTER-noW , 



1825. 



