} 
No. 160, Vor. XXVIL | APRIL, 1884. 
Established by BENJAMIN SILLIMAN in 1818. 
THE 
| MERICAN ; 
EDITORS " eats : 
_ JAMES DL ann B. S. DANA. anp B. SILLIM 
ASSOCIATE EDITORS ee 
Proressors ASA GRAY, J OSIAH P. COOK 
eee Shoei ae mi ting or Caunrrpes, 
