d^c-"* -J^-U- 



nr\ 



THE FORMATION 



OF 



VEGETABLE MOULD, 



THROUGH THE 



ACTION" OF WOEMS, 



WITH 



OBSERVATIONS ON THEIR HABITS. 



BY 



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



WITH ILLUSTRATIONS. 



NEW YOKK: 



D. APPLETON & COMPANY, 



1, 8, and 5 BOND STREET. 



1888. 



