August i6, 1889. J 



SCIENCE. 



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OFFICE and MANUFACTORY: 



402 and 404 Greenwich Street, Ne\^ 

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New England Office, 19 Pearl St,, Boston 



Philadelphia Office, 301 Arch St. 



Western Office, 139-141 Adams Street 

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31-^-^-'r' Southern Office, 25 Carondelet Street, 

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IVajiis. 



A YOUNG MAN can have lucrative engage- 

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 N. D. C. HODGES, 



47 Lafayette Place, New York. 



TV/r ECIIANICIAN —An optician and maker 

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 would be glad of a position where his skill 

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A HARVARD GRADUATE I'Sg) desires during I i 

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geological field work. Refers to Professors Shaler ai 



Davis. Address Box no, Newton, Mass. 



A NEW MICROSCOPE. 



Having invented an iinpioved form of micro- 

 scope, I will assign an interest in the patent for 

 financial assistance in manufacturing. It is be- 

 lieved that a pov.'erful instrument may be made 

 on the new principle at low cost. 



FRANK ANTON BECXER, 530 E, 16th St., N.Y. 



A TEMPORARY BINDER 



for Science is now ready, and will be mailed 



postpaid on receipt of ]-rice. 



Half Alorocco - 75 cents. 

 This binder is strong, durable and 

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Mineral Lmids. 



MANGANESE DEPOSITS. —A rich de- 

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GOLD-BEARING QUARTZ VEINS.— 

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RED SLATE. —A valuable deposit of red 

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Established 1852 



Microscope Stands, 

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Also Lime and Electric Light Apparatus, and 



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J. B. COLT & CO., Manufacturers, 



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SUCCESSORS 10 



K. & J. BECK, 



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Manufacturers and Im|. oners of 



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