AMERICAN 
JOURNAL OF SCIENCE ANDLARTS. 
[SECOND SERIES.] . 
inte 
| Arr. XV.— Obsetirations o ont the Coatrast in the Php B ea oe 
World ; by Prof. ARNoLp Guxor.* 
tures and Resolurces between..the “Old World and the New 
ee wt" 
THE appearance of Professor Guyot’s work’on Physical Bees, 
The pleas 
ae | 
