THE FORMATION 



VEGETABLE MOULD, 



THROUGH THE 



ACTION" OF WOEMS, 



OBSERVATIONS ON THEIR HABITS. 



BY 



CHARLES DARWIN, LL.D., F.R.S. 



WITH ILLUSTRATIONS. 



NEW TOEK: 

 D. APPLETON AND COMPANY, 



72 FIFTH AVENUE. 

 1896. 



