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SCIENC 



(Entered at tlie Posi-Offlee of New York, NA'., as Second-Class Matter.J 



Ninth Yeae. 

 Vol.. XVII. No. 417. 



NEW YORK, Januaet 30, 1891. 



Single Copies, Ten Cents. 

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Seasonable .*. Science .'. Studies 



THE OATALOG-UE OF THE 



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