Dr. Cyrus Adler, 



Librarian U. S. Nat. Museum. 



YOL. XII. 



AUGUST, 1901. 



Established by 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. 



FOURT H SERIES. 



YOL. XII— [WHOLE NUMBER, CLXIL] 



No. 68.— AUGUST, 1901. 



NEW HAVEN, CONNECTICUT. 



1901. 



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



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

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