as. D. Walcott, 



U. S. Geol. Survey. 



VOL. II. 



V 

 NOYEMBEE, 1896. 



Established by BENJAMIN SILLIMAN in 1818. 



THE 



AMERICAN 



JOURNAL OF SCIENCE 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE, 

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



Professors O. C. MARSH, A. E. YERRILL 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. 



YOL. II— [WHOLE NUMBER, CLIL] 



No. 11.— NOYEMBER, 1896. 



NEW HAYEN, CONNECTICUT. 



1896. 



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