PREFATORY NOTE. 
HE materials for the preparation of the following 
Memoir have been enriched by the letters which 
Sir Joseph Hooker and Mr. Francis Darwin have kindly 
lent me. I am under further obligation to Sir Joseph 
Hooker for permission to print his letters to Mr. Bates, 
and to Mr. Darwin for permission to print certain letters 
from his father. 
To these acknowledgments should be added that of 
the courtesy of the Council of the Linnean Society, in 
consenting to the reproduction of some of the coloured 
drawings which illustrated the paper on “ Mimicry” on 
its publication in the Society’s 7vansactions, vol. xxiii., 
1862. 
Bre: 
LIBRAR 
NEW YC 
GARDET 
