Unas v. vvaicott, 



U. S. Geol. Survey. 



VOL. VI. 



OCTOBER, 1898. 



Established by BENJAMIN SILLIMAN in 1818. 



THE 



AMERICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE, 

 II. P. BOWDITCH and W. G. FARLOW, of Cambridge, 



Professors O. C. MARSH, A. E. VERRILL and II. S. 

 WILLIAMS, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia, 

 Professor II. A. ROWLAND, of Baltimore, 

 Mr. J. S. DILLER, of Washington. 



FOURTH SERIES. 

 VOL. VI— [WHOLE NUMBER, CLVL] 



No. 34— OCTOBER, 1898. 



NEW HAVEN, CONNECTICUT. 



1S98. 



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