Photographs courtesy Geigy Chemical Corporation.

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Follow the lead of the leaders... U S E S & S ANALYTICAL

Geigy Chemical Corporation administrative offices, chemical research and development labo­ratories, Ardsley, New York.

Known by the company they keep-

and the companies they serve

FILTER PAPERS Your job is accurate analysis.

Our job is to give you the finest working tools available for analysis, filtration or chromatography.

When you specify S&S analytical filter papers, you work with lower ash (0.007%), higher alpha cellulose content (>98%), and uniformity from lot to lot.

Your job is easier and analysis more accurate because you can depend upon the same filter paper performance every time. Your purchasing agent pays no price premium for this precision American-made product used in the nation's leading laboratories.

Test S&S filter papers in your laboratory. See why these quality controlled papers— designed to exceed specifications for comparable products—are being used more and more as a reference standard.

F R E E S&S SAMPLER Send your name, company and address for a sampler of S&S analytical filter papers and a "Quick Reference" catalog with convenient filtration chart. No obligation. Address: Department G, Carl Schleicher & Schuell Company, Keene, New Hampshire.

C A R L S C H L E I C H E R & S C H U E L L C O . K E E N E . N E W H A M P S H I R E

• S&S will cooperate with research chemists desiring test quantities of analytical filter papers for experimental work. For full details, address your letter to the attention of the President.

F O R H I G H E S T P R E C I S I O N ,

specify S&S Analytical Filter Papers

available at your favorite laboratory supply house