TO 
HIS GRACE 
THE DUKE OF ARGYLL, K.T., F.R.S., &c.. 
IN TESTIMONY OE 
APPRECIATION OE HIS LIFE-LONG INTEREST IN ORNITHOLOGY, AND WITH A DEEP SENSE OF THE 
VALUE, IN THE ADVANCEMENT OF OTHER SCIENCES, OF THE ORIGINAL 
RESEARCHES TO WHICH HE HAS DEVOTED THE 
PORTION OF TIME WHICH COULD BE SPARED FROM THE DISCHARGE OF IMPORTANT 
PUBLIC DUTIES, 
®{jis jitantir €Yitm\ uf 
A MONOGRAPH OF THE TROGONIDiE, 
OR FAMILY OF TROGONS, 
% 
IS DEDICATED, 
BY 
THE AUTHOR 
