

14116-15 



SCIENCE 



[Entered at the Pogt-Oflice of New York, N.V., as Second-Class Matter.J 



Ninth Year. 

 Vol. XVm. No. 464. 



NEW, YORK, December 25, 1891, 



Single Copies, Ten Cents. 

 > T>,5g Year, in Advance. 



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THE 



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This Coinpaiiy owns the Letters 

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First inserted June 19. No resjoise 

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N. D. C. HODGES, 

 8T4 BROADWAY, NEW YOEK. 



