JAN Ibipqs 



rP 



56 BOSS 





Eleventh Year. 

 Vol. XXI. No. 519. 



JANUAEY 13, 1893. 



Single Copies, Ten Cents. 

 $3.50 Per Year, in Advance. 



Contents. 



The Work of the U. S. Geological Survey. 



J. W. Powell 15 



The Geological Society of America 17 



Seventh Annual Meeting of the Iowa Acad- 

 emy of Science 18 



Unusual Abundance op the Grosbeak in East- 

 ern Massachusetts. J. H. Boivles 19 



Notes and News 1^ 



Recent Progress in American Horticulture. 



L. H. Bailey 20 



The Importance of •' Next-to-Nothing" in 



Chemistry. W. H. Pendlebury 23 



Bread-Fruit Trees in North America. F. H. 



Knowlton 24 



Notes on Mars and Meteors. E. Miller Law 



25 



LEtTERS TO THE EDITOR. 



Breathing Wells. Goodwin D. Swezey 25 



Hybridism in Genus Colaptes. Alvah A. 



Eaton 25 



How Shall I Study Ants? Dwight Goddard. 25 



Book Reviews. 



Waterdale Researches 26 



Cosmical Evolution 26 



Dynamics of Rotation 27 



Mechanical Drawing 27 





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