Bs Qo ms AY 3 ¢ 
Ohartes I. W alcott, 
Offics Geolosical Survoy.- 
* Wo. 1935 Vor. XXXII. JANUARY,,. 1887. 
Established by BENJAMIN SILLIMAN in 1818. 
THE 
AMERICAN 
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JOURNAL OF SCIENCE. 
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THIRD SERIES, 
VOL. XXXIII.—[WHOLE NUMBER, OXXXIII.] 
No. 1983—JANUARY, 1887. 
NEW HAVEN, CONN.: J. D. & E. 8. DANA. 
1887. 
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