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PHILADELPHIA 



ONE PLEASED PURCHASER WRITES 

 As I use my microscope more I am more pleased with it; all my friends are also pleased an<£ 

 pronounce it a fine microscope. J 



ANOTHER WRITES 



The microscope you sent me was received in perfect condition and (is) in every way satis- 

 factory. I found (it) to be in every way exactly as you represented. 



The Fern Book 



Prepare for another season's collect- 

 ing by getting a copy of "Our Ferns 

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 east of the Rocky Mountains can fail 

 to identify the ferns of his locality if 

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 but the text is so full and so clear as 

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 It has the only illustrated key ever 

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 and 340 pages of text. Sent postpaid 

 for $2.15. With a year's subscription 

 to this magazine for $2.70. 



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Scientific Amcricai 



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