Science . SCIENCE—ADVERTISEMENTS MBiHI MIW WlSSf I %IIM %IIginI I Wilgigl IM Mi Mi M> Ml. A SIGN OF QUALITY A MARK OF SERVICE Advancement of Science and the development of scientific instruments go hand in scientific discoveries make new instruments necessary andnew instruments make further discoveries possible. When we get through making scientific apparatus—if we ever get through^—^we hopeto have made the name WELCH to stand for a standard ofquality that has not been surpassed. To attain the highest possible standard of service is the purpose that dominates all other consid
Science . SCIENCE—ADVERTISEMENTS MBiHI MIW WlSSf I %IIM %IIginI I Wilgigl IM Mi Mi M> Ml. A SIGN OF QUALITY A MARK OF SERVICE Advancement of Science and the development of scientific instruments go hand in scientific discoveries make new instruments necessary andnew instruments make further discoveries possible. When we get through making scientific apparatus—if we ever get through^—^we hopeto have made the name WELCH to stand for a standard ofquality that has not been surpassed. To attain the highest possible standard of service is the purpose that dominates all other considerations in the designing and building of WELCH Laboratory Apparatus and Supplies. CATALOGS ON REQUEST (A) Agriculture (B) Biology (C) Chemicals (G) Physics(5C) General School Supplies A SIGN OF QUALITY iMi li.: A MARK OF SERVICE W. M. WELCH SCIENTIFIC COMPANY Manufacturers, Importers and Exporters of Scientific Apparatusand School Supplies 1516 Orleans Street CHICAGO, ILL., U. S. A. Wtl-M MIM%BM MIgiBI WtlgSJl WIIgloIlWSIgiH^ SCIENCE Friday, October 21, 1921. The Direction of the Ev
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