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LABORATORY

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4-Aminoantipyrine · Ammonium Purpurate · Bindschedler's Green 2-Bromoethylamine HBr · tert-Butyl Chloride · Cesium Chloride 5-Chlorosalicylaldehyde · 3,5-Dichlorosalicylaldehyde · Esculin Disodium Succinate · Ethyl Crotonate · Fluorescein · Furoic Acid Hofmann's Violet · 3-lndolebutyric Acid · Levulinic Acid · Methyl Acetamide Methyl-tert-Butyl Ether · Methylene Iodide · p-Naphtholbenzein 4-(4-Nitrobenzyl)Pyridine · Oxamide · Potassium & Sodium m-Periodates Rhodanine · Sodium-4-Hydroxybutyrate · Thioacetamide · Veratraldehyde

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Laboratory Service Center (Equipment, Materials, Services, Instruments for Leasing), M a x i m u m space — 4 inches per advertisement. Column width, 2 - 3 / 1 6 " ; t w o c o l u m n width, 4 - 9 / 1 6 " . Artwork a c c e p t e d . No c o m b i nation of directory rates with ROP advertising. Rates based on number of inches used within 12 months f r o m first date of first insertion. Per inch: 1 " — $ 1 7 5 ; 1 2 " — $ 1 7 0 ; 2 4 " — $ 1 6 5 ; 3 6 " — $ 1 6 0 ; 4 8 " — $155. CALL

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Multidisciplinary in nature and international in scope, Journal of Chemical and Engineering Data features contributions by distinguished scientists from the world over. Their expert reports represent numerical data bases for private technical information systems, particularly in industry, that will broaden your scientific horizons and improve the quality of your work. This quarterly journal publishes precise, accurate data on physical, thermodynamic, and transport properties of welldefined material. It also keeps you informed about the latest international standards on symbols, terminology, and units of measurement for reporting data properly. EDITOR: Kenneth N. Marsh, Texas A&M University 748 A · ANALYTICAL CHEMISTRY, VOL. 63, NO. 14, JULY 15, 1991

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