THE FORMATION ^'(^Picii s-.''>' 



VEGETABLE MOULD, 



THROUGH THE 



AOTIOI^ OF WOEMS, 



OBSERVATIONS ON THEIR HABITS. 



/ BY 



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



WITH ILLUSTRATIONS. 



NEW YORK: 



D. APPLETON & COMPANY, 



1, 3, AND 5 BOND STEEET. 



1882. 



