INDEX TO ADVERTISERS IN THIS ISSUE Academic Press» Inc 128

Flamm Advertising Ace Glass, Inc 115

Heller Creative Ad. Ace Scientific Supply Co,, Inc 142 Aero Vac Corp 89

MacDonald, Devey & Holdsworth Aldrich Chemical Co., Inc 131

The Barry Agency Angstrom, Inc 141 Applied Science Laboratories, Inc 58

Barash Advertising

Β aird-Atomic, Inc 59 Van Christo Associates

J. T. Baker Chemical Co 38 Basfoxd, Inc.

Barber-Colman Co 70 E. R. Hollingsworth & Assoc.

Bausch & Lomb, Inc 47:122 Wolff Associates, Inc.

Beckman Instruments Inc. Cedar Grove Operations 120

Lescarboura Advertising, Inc. Scientific Instruments JOiv 81:83:85 Spinco Div 1:22

Hixson & Jorgensen, Inc. Bel-Art Products 123

Gallard Adv. Agency Berkeley Scientific Laboratories 112

William C. Robin & Associates Bethlehem Apparatus Co., Inc 4 1

Beaumont, Heller & Sperling, Inc. James G. Biddle Co 64

The Michener Co. Bio-Bad Laboratories 104

Cappel, Pera & Reid, Inc. Brinkmann Instruments, Inc . . . .50:68:88:132

The Shaller-Rubin Co., Inc. Brookfield Engineering Laboratories,

Inc 82 Creamer, Trowbridge & Case, Inc.

Brunswick Corporation (Aloe Scientific) 113 Kenyon & Eckhardt, Inc.

Buchler Instruments, Inc 39 Selvin & Jaffe

Burdick & Jackson Laboratories, I n c . . . 130 Studio 5 Advertising

Cahn Instrument Co 42:53 Haas & Zimmerman

Carle Instruments, Inc 79 Cochrane Chase & Co.

Gary Instruments 49:124 The Bowes Co.

Chemical Materials Catalog. 104 Persons Advertising, Inc.

Chromatronix, Inc 140 Bonfield Associates, Inc.

Coleman Instruments Corp 118 Winfield Advertising Agency, Inc.

Cosmos Scientific Co 142 E. Newgard Adv.

W. H. Curtin & Co 127 Robinson-Gerrard, Inc.

Harry W. Dietert Co 40 Watkins-Rogers, Inc.

Dimeo-Gray Co 130 Weber, Geiger & Kalat, Inc.

Distillation Products Industries 24 Rumrill & Hoyt, Inc.

Eastern Industries, Div. of Laboratory for Electronics, Inc 112

Hepler & Gibney, Inc. Engelhard Industries, Inc 136

ICeyes, Martin & Co. Extracorporeal & Medical Specialties

Co., Inc 36 Clawges Associates, Inc.

Fabri-Tek, Inc 27 Midland Associates, Inc.

Farrand Optical Co., Inc 64 Snow •& Depew, Inc.

Federal Pacific Electric Co 79 Daniel and Charles, Inc.

Fisher Scientific Co 86:106:125 Fuller & Smith & Ross, Inc.

The Foxboro Company. 21 Whitten-LaTucky, Inc.

Galileo Corp 130 Artley, Inc.

Gelman Instrument Co 108 Active Advertising Assoc.

General Electric Co 100 George R. Nelson, Inc.

Gilford Instrument Laboratories, Inc . . 114 Garber-Evans Advertising, Inc.

Graphic Controls Corp 16 Muller, Jordan and Herrick, Inc.

Greiner Scientific Corp 63 Fairfax, Inc.

Hallikainen Instruments Corp 76 Hal Lawrence, Inc.

Hamilton Co., Inc 18:91 Swain/Mealer, Inc.

The Harshaw Chemical Co 80 The Griswold-Eshleman Co.

Hewlett-Packard, F&M Scientific D i v . . . 113 Richardson, Thomas 6ε Bushman, Inc.

Hoke, Incorporated 50:51 Tek-Mark, Inc.

1 2

72

Infotronics Corp Robinson-Gerrard, Inc.

Instrumentation Laboratory, Inc Pazolt & Co.

Instrumentation Specialties Co., I n c . . . . 69 Graham Printing and Advertising

Service Instruments for Research & Industry. . 33

Heller Creative Advertising International Crystal Laboratories 87

Raymond-Nicholas Adv. Is omet Corporation 118

Armand Richards Advertising Agency

Jarrell-Ash Co.. 6:96 Culver Advertising, Inc,

JEOLCO (U.S.A.), Inc 45 Robert Hartwell Gabine

Johns-Man ville Corp 135 Cunningham & Walsh, Inc.

Kewaunee Manufacturing Co 128 Phillipps Associates, Inc.

Klett Mfg. Co., Inc 56 Kontes Glass Co 136

Garceau, Hargrave & McCullough, Inc.

Labindustries 77 Bonfield Associates, Inc.

Laboratory Construction Co IFC Valentine-Radford, Inc.

Laboratory Equipment Corp 108 Creative Advertising, Inc.

Ledoux & Co 107 Leeds & Northrup Co 90

Gaynor & Ducas, Inc. Lindberg/Hevi Duty, Div. of Sola In­

dustries 110 Marsteller, Inc.

The London Co 99 Ritchie & Sattler, Inc.

Mallinckrodt Chemical Works 75 Winfield Advertising Agency, Inc.

Materials Research Corp 37 Keyes, Martin & Co.

The Matheson Co., Inc 78 Leonard M. Sive & Associates, Inc.

Matheson, Coleman & Bell 5 Leonard M. Sive & Associates, Inc.

McPherson Instrument Corp 7 Briant Advertising

E. Merck, AG 23 Deutsche Anzeigen GMBH

Mettler Instrument Corp 10:117 Mort Barish Associates, Inc.

Microchemical Specialties Co 6 Millipore Filter Corp 141

Culver Advertising, Inc. Milton Roy Co 107

The Harry P. Bridge Co.

The Nalge Co., Inc 137 Wolff Associates, Inc.

Nester/Faust Mfg. Corp 43 ÀHyn H. Jacobson

Nuclear-Chicago Corp 32:67 Texas Nuclear Corp., Subsidiary

Sidney Clayton & Associates, Inc. Nuclear Products Co. . . IBC

Falls Advertising Co.

Ohaus Scale Corp . . , . , . . 36 Robert M. Baldwin Co,

Outokumpu Oy. . 102 Erva-Latvala Oy

Owens-Illinois, Inc . . 65 Meldrum & Fewsmith, Inc.

Parr Instrument Co 108 F. Willard Hills

Perkin-EImer Corp.. . . . . . . .26:57:71:97:105 Gaynor & Ducas, Inc.

Pharmacia Fine Chemicals, Inc 35 Paul Klemtner & Co., Inc.

Philbrick Researches, Inc 98 Culver Advertising, Inc.

Philips Electronic Instruments. . . . . . . . 60 Anders Advertising, Inc.

Phoenix. Precision Instrument C o , . . . . . 56 Product Promotions Agency, Inc.

Photovolt Corporation 41:87:141 The M. B. Pearlman Co.

Picker-Nuclear 28:92 Dean L. Burdick Associates, Inc.

Precision Scientific Co 129 ' Tri-State Advertising Co., Inc.

Preiser Scientific, Inc 142 E. Newgard Adv.

Professional Tape Co., Inc 104 Robert Peterson Advertising Agency

Quartz Products Corp 108 Raymond-Nicholas Advertising

Radio Corp. of America 54 Al Paul Lefton Co., Inc.

Rosemount Engineering Co 123 Colle & McVoy Advertising Agency,

Sadtler Research Laboratories, Inc . . . . 14 Romer & Co., Inc.

Sage Instruments, Inc 103 Lescarboura Advertising Inc.

Ε. Η. Sargent & Co 74:119 Sidney Clayton & Associates, Inc.

Carl Schleicher & Schuell Co 31 Wildrick & Miller, Inc.

Scientific Glass Apparatus Co., Inc I l l Scientific Industries, Inc 20

S. M. Sachs & Associates, Inc. Scientific Products, Div. of American

Hospital Supply Corp 66 Alex T. Fraz, Inc.

Sep-Ko Chemicals, Inc . . . 34 Faber Advertising, Inc.

Sigmamotor, Inc 141 Gelia and Wells, Inc.

Supelco, Inc 133 Barash Advertising

Technical Equipment Co 25 Tallant/Yates Adv. Inc.

Technicon Controls, Inc 52 Mediad, Inc.

Texas Nuclear Corp., A Subsidiary of Nuclear-Chicago Corp 32:67

Sidney Clayton & Associates, Inc. Thermal American Fused Quartz Co. . . 134

JCniep Associates Thermolyne Corp 44

E. R. Hollingsworth & Associates Arthur H. Thomas Co . .116:117 Tracerlab, A Div. of Laboratory for

Electronics, Inc . . 109 Hepler & Gibney, Inc.

Tracerlab, A Div. of Laboratory for Electronics, Inc 48

Bonfield Associates, Inc, Tri-R Instruments, Inc 132

University of Canterbury . 104:130 Spajer Murdoch & Co., Ltd.

Varian Aerograph formerly Wilkens Instrument & Research, Inc 55

Bob Barriskill The Victoreen Instrument Co 20-21

Palm & Patterson, Inc.

Wang Laboratories, Inc 62 Larcom Randall Advertising, Inc.

Warner-Chilcott Laboratories Instru­ments Div. . 8-9

Bonfield Associates, Inc. Waters Associates, Inc OBC

Studio D, Inc. Wilkens-Anders on Co 95

Mandabach & Simms, Inc.

VOL. 38, NO. 13, DECEMBER 1906 * 1 3 9 A

New liquid chromatography columns Better in five ways:

2 Sharper separations. « 4 * " Thin Teflon bed % supports at top and

bottom fan out and collect stream with

ι , , minimal mixing. 2 A" ΨΡβδ o f separa-1 tions. Same column

will do ion exchange, gel permeation, and adsorption chroma­tography—with down­ward or upward flow and recycling.

3 Chemically inert. 1 Only glass and Teflon touch the stream.

A Pressurized opera-" tion. Resilient end

seals won't leak at pressures up to burst­ing point of glass col­umn itself.

5 Automatic sample " injection. Cheminert™ valves will inject sam-

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a controlled air lines for unattended opera­tion. These columns are the latest addition to our expanding line of

k improved chromatog­raphy equipment. Like Chromatronix valves and fittings, they are

., chemically inert and designed without mix­ing cavities. One-inch columns are adjust­able from 12 to 22

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Send for more data:

CHROMATRONIX I N C O R P O R A T E D 2743-8th St., Berkeley, Calif. 94710 Phone (415) 841-7221

Yellow Springs Instrument Co., I n c . . . . 48 Odiornc Industrial Advertising, Inc.

Laboratory Supply Center. 138

Burdick & Jackson Laboratories Eastern Chemical Corp. George W. Gates & Co. GCA Corporation Gollob Analytical Service, Inc. William J Hacker & Co., Inc. Hill Engineering1 & Mfg. Co. LaMotte Chemical Products Co. Petroleum Analytical Research Corp. Southwestern Analytical Chemicals

REINHOLD PUBLISHING CORPORATION

A Subsidiary of Chapman-Reinhold, Inc.

Advertising Managem-ent for the American Chemical Society Publications

430 Park Ave., New York, N.Y. 10022

Cable Address: REINPUB NYK

Thomas N. J. Koerwer Advertising Sales J^irector, ACS Publications

Arthur P. Watts Advertising Sales Manager, AC

J. Barry Stanford Assistant Advertising Sales Manager, AC

SALES REPRESENTATIVES

New York 10022 . . . Arthur P. Watts, J. Barry Stanford, Sana W. Percy, Robert N. Gillespie, William N. Wham, Reinhold Publishing Corp., 430 Park Ave, 212-688-8600

Chicago 60603 . . . Eugene P. Eldridge, Reinhold Publishing Corp., 10 So. La Salle St., 312-726-1282

Cleveland 44114 . . . Joseph C. IToopes, Reinhold Publishing Corp., East Ohio Bldg., 1717 East 9th St., 216-771-4011

San Francisco 94109 . . . Denis A. Cardone, Reinhold Publishing Corp., 1255 Post St., 415-771-7044

Los Angeles 90045 . . . Clay S. Holden, Reinhold Publishing Corp., 8939 So. Sepulveda Blvd., 213-776-0552

Portland 97221 . . . Francis M. Eaton, Roy McDonald Associates, Inc., 2035 S.W. 58th Avenue, 503-292-8521

Denver 90203 . . . Robert H. Heidersbaeh, Roy McDonald Associates, Inc., 846 Lincoln St., 303-825-3325

Houston 77006 . . . Frank N. Vicierey, Roy McDonald Associates, Inc., 3130 South­west Freeway, 713-529-6711

Tulsa 74114 . . . Max C. Nelson, Roy Mc­Donald Associates, Inc., 570 South Harvard, 918-742-9961

Great Britain and Western Europe . . . Brayton Nichols, The American Magazine Group, 44 Conduit Street, London, W. 1, 'England

Japan . . . Bancho Koheki Co., Ltd., 8, Shinano-machi, Shinijuku-ku Tokyo, Ja­pan

PROMOTION DEPARTMENT

Robert Voepel Promotion Manager

PRODUCTION DEPARTMENT

Alfred E. Gall Advertising Production Oirector,

ACS Publications

Anne Forrest Advertising Production Manager,

Analytical Chemistry

_>•-••»

\

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>3 )̂ The U. S. Government does not pay ^y for this advertisement. It is presented βιΒβ as a public service in cooperation with %Kztk the Treasury Department and The jggH Advertising Council.

Circle No. 30 on Readers' Service Card

1 4 0 A » ANALYT1CAI CHEMISTRY