The American Naturalist 



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Price List (No. 11) of Bird Skins. This 

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 order, based on the classification of the British 



names, indications of localities, and an index 

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Fifty Years of Darwinism 



Comprising the eleven addresses in honor 

 of Charles Darwin delivered before the 

 American Association for the Advance- 



Henry Holt & Company 



34 West 33d St., New York 

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Microscopes and Accessories 



Hand Cameras of Highest Quality 

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Scientific Instruments 



Laboratory Apparatus 



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