ON THE 



SCIENCE OF AGRICULTURE 



COMPRISING 



A COMMENTARY ON AND COMPARATIVE INVESTIGATION 

 OF THE 



AGRICULTURAL CHEMISTRY 



OF 



MR, KIRWAN AND SIR HUMPHRY DAVY; 



THE 



CODE QF 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 important 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. 



DeUicateti to ti>e 



BY JOSEPH HAYWARD, 



AUTHOR OF THE SCIENCE OF HORT1CULTUJ 



LONDON: 



PRINTED FOR 



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



PATERNOSTER-ROW 



1825. 



