No. 165, Vou. XXVIII. SEPTEMBER, 1884. 
Established by BENJAMIN SILLIMAN in 1818. 
THE 
AMERICAN 
JOURNAL OF SCIENCE. | 
pine inet 
EDITORS . eae 
JAMES D. anp E. s. DANA, ano B. SILLIMAN. | 
ASSOCIATE EDITORS 
Proressors ASA GRAY, JOSIAH Pp. COOKE, itn” 
JOHN TROWBRIDGE, oF Sesemen 
