ON 



FARMYARD MANURE, 



THE DRAININGS OF DUNG-HEAPS, 



AND THE 



ABSORBING PROPERTIES OF SOILS. 



BY 



DR. AUGUSTUS VOELCKER. 



LONDON: 

 PRINTED BY W. CLOWES AND SONS, STAMFORD STREET, 



AND CHARING CROSS. 



1857. 



