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Merck Butyl Alcohol Normal Reagent being used in a Craig countercurrent extraction apparatus in steroid chemistry research.

MOST CONVENIENT Sizes suitable for laboratory use are readily available from all Merck distributors.

MOST VERSATILE Merck Reagent Solvents offer a wide range of solvent prop­erties and physical characteristics.

SUPERIOR QUALITY Their purity makes them invaluable for column or paper chromatography, as noncatalyzing media in organic syn­theses, and for recrystallizations.

SPECIALLY DESIGNED Merck Spectro Grade Solvents are designed especially for spectrophotometry. They may be used without further purification, assuring reproducible results.

Acetone Carbon Tetrachloride

Chloroform Methyl Alcohol Anhydrous

Methylene Chloride Iso-octane

Isopropyl Alcohol

REAGENT GRADE Acetone Reagent (A.C.S.) Benzene Reagent (A.C.S.)

Butyl Acetate Normal Reagent Capryl Alcohol Reagent

Ether Anhydrous Reagent (A.C.S.) Methyl Ethyl Ketone Reagent

Nitromethane Reagent Anhydrous Tetrahydrofuran Reagent Trichlorethylene Reagent Xylene Reagent (A.C.S.)

And Many Others

Precision Tools for Accurate Analysis

9 M«ck * Co.. lac.

MERCK & CO., INC. Manufacturing Chemists

R A H W A V . N E W J 6 R S Ε V

VOLUME 33. NO. 21 · · · · MAY 23. 1955 2221

SPECTRO G R A D i

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