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 VOL. Ill 



FEBRUARY, 1922 



Established by BENJAMIN SILLIMAN in 1818. 



THE 



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AMERICAN 



JOURNAL OF SCIENCE. 



Editor: EDWARD S. DANA. 



ASSOCIATE EDITORS 



Pbopessoks WILLIAM M. DAVIS and REGINALD A. DALY, 



of Cambridge, 



Professors HORACE L. WELLS CHARLES ^<™*. 



HERBERT E. GREGORY, WESLEY R COB and 



FREDERICK E. BEACH, op New Haven, 



Pkofessor EDWARD W. BBBBY, ot Bi^ W 

 Drs. FREDERICK L. RANSOME and WILLIAM BOWIE, 



of Washington. 





FIFTH SERIES 



VOL. III-[WHOLE NUMBER. GCIII], 

 No. 14-FEBRUARY, 1922. 



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