CIENCE 



Sixth Year. 

 Vol. XI. No. 270. 



NEW YORK, APRIL 6, li 



Single Copies, Ten Cents. 

 )3.5o Per Year, in Advance. 



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e as Second-Olass Mail-Matter. 







Editorial ..... 





159 



Book-Reviews. 





Inteinational Copynglu. — Mr. G. E. Goodfellow's Report on 

 the Sonora Earthquake. — The Audubon Monument. 





The Long White Mountain 





168 



Helen Keller .... 





160 



A Manual of Analytical Chemistry 

 The Urine 





16S 

 168 



Scientific News in Washington. 













The Sonora Earthquake .... 





162 



Notes and News 





169 



Distortion in Plane-Table Sheets 





166 









Electrical Science. 







Letters to the Editor. 







Alternating versus Continuous Current Distribtition . 





167 



Dr. Edward Tyson and the Doctrii 



e of Descent 





Electric Motors for Mining-Work 

 F'arbarky and Schenck Accumulators 





168 

 16S 





Charles F. Cox 



169 



The SchanscheifF Primary Battery 





16S 



Temperature of the Saco River 



John M. Batchelder 



170 



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