as. D. Walcott, 



U. S. Geol. Survey. 



^" VOL. II. 



JULY, 1896. 



Established by BENJAMIN SILLIMAN in 1818. 



T II E 



AMERICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIA.TE EDITORS 



Pkofessors GEO. L. GOODALE, JOHN TROWBRIDGE, 

 H. P. BOWDITCH AND W. G. FARLOW, of Cambridge, 



Professors H. A. NEWTON, O. C. MARSH, A. E. VERRILL 

 AND H. S. WILLIAMS, OF New Haven, 



Professor GEORGE F. BARKER, of Philadelphia, 

 Professor H. A. ROWLAND, of Baltimore, 

 Mr. J. S. DILLER, of Washington. 



FOURTH SERIES. 

 VOL. II— [WHOLE NUMBER, CLIL] 



No. 7.— JULY, 1896. 



NEW HAYEN, CONNECTICUT. 



1896. 



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