SCIENCE 
NEw SERIES. SINGLE COPIES, 15 CTS 
VoL. X. No. 242, FRipay, AvuGust 18, 1899. ANNUAL SUBSCRIPTION, $5.00 
Chemicals « ai Chemical Aaa 
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ZEISS’S PHOTO. MICROGRAPHIC STAND 
With Berger’s New Style Upper Section 
FIMER & AMEND New York 
SCHOTT & GEN., Jena Laboratory Glassware 
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