bi 
ert? 
Poh zit! 
THE HALL OF 
THE AGE OF MAN 



GUIDE LEAFLET SERIES, No. 52 
a ¢ 
tine 
iF b 9 bk: ‘4 j } abi di te . 
ag eh ett) eee 4 te 4 
By HENRY FAIRFIELD OSBORN 

eis] 
ihe 
iti 
re 
; 
‘7 7 
+ 
4 ; 
i 
7 
Ne 
Sih 
tt 
eee | 

MAY, 1921 
