No. 170, Vou. XXEX. EK 
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Established by BENJAMIN SILLIM,. a 
bronchi oes - ar, and T. Crate, 
‘oss, $5 per 
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AMHRICAN 
JOURNAL OF SCIENCE. 
EDITORS 
JAMES D. ann E. 8S. DANA, anp B. 
ASSOCIATE EDITORS ay aie te Hie A 
Provessors ASA GRAY, JOSIAH P. COOKE, axv ce 
‘JOHN TROWBRIDGE, 6 ee a 
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Peoressors H. A, NEWTON ayp A. E. VERRIL 1 OF 
New Haven, 
