I ■ : :■ -. -r. 



VOL. L. 



INDEX TO VOLS. XLI-L. 



Established by BENJAMIN SILLIMAN in 1818. 



THE 



VxD\ 



AMERICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Professors GEORGE L. GOODALE, JOHN TROWBRIDGE, 

 and WM. M. DAVIS, of Cambridge, 



Professors A. E. VERRILL, HORACE L. WELLS, CHARLES 



SCHUCHERT, H. E. GREGORY, and HORACE S. 



IJHLER, of New Haven, 



^mst 



Professor JOSEPH S. AMES, of Baltimore, 

 Mr. J. S. DILLER, of Wa 



FOURTH SE 



VOL. L. — [WHOLE NUMBE 

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January, 1021. 



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