Librarian U. S. Nat. Museum. 



VOL. XVII. JANUARY, 1904. 



Established bv BENJAMIN SILLIMAN in 1818. 



THE 



AMERICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEO. L. GOODALE, JOHN TROWBRIDGE, 

 W. G. FARLOW and WM. M. DAVIS, of Cambridge, 



Professors A. E. VERRILL, HENRY S. WILLIAMS and 

 L. V. PIRSSON, of New Haven, 



Professor GEORGE F. BARKER, of Philadelphia, 



Professor JOSEPH S. AMES, of Baltimore, 



Mr. J. S. DILLER, of Washington. 



FOURTH SERIES. / 

 VOL. XVII— [WHOLE NUMBEPj/cLS^tlL] 



No. 97.— JANUARY, 19oW*!^ 



NEW HAVEN, CONNECTICUT. 



1904 



THE TUTTLE, MOREHOUSE & TAYLOR CO., PRINTERS, 125 TEMPLE STREET. 





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Published monthly. Six dollars per year, in advance. $6.40 to countries in the 

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