TO 
THE REV. WILLIAM COLENSO, M.A, 
ANDREW SINCLAIR, MD, R.N,, 
DAVID LYALL, MD, EN, 
This Work, 
WHICH OWES SO MUCH TO THEIR INDEFATIGABLE EXERTIONS, 
IS DEDICATED 
BY THEIR VERY SINCERE FRIEND, 
J. D. HOOKER. 
ROYAL GARDENS, KEW, 
November, 1853. 
