ON THE 



COMPOSITION 



OF 



FARMYARD MANURE, 



THE CHANGES WHICH IT UNDERGOES ON KEEPING 

 UNDER DIFFERENT CIRCUMSTANCES. 



BY DR. AUGUSTUS VOELCKER, F.C.S., 



PROFESSOR OF CHEMISTRY IN THE ROYAL AGRICULTURAL COLLEGE, CIRENCESTER. 



LONDON: 



PRINTED BY W. CLOWES AND SONS, STAMFORD STREET, 



AND CHARING CK08S. 



1856. 



