Mr. Robert M. Schnier

Formerly of

Ε. Machle t t and Son

and

Coleman Instruments , Inc.

Announces the formation of

Analytical Equipment, Inc.

29-46 Northern Blvd., Long Island City 1, Ν . Υ.

Tel. EMpire 1-1035

Servicing . Rent ing . Leasing

Coleman and Beckman Instruments

Circle No. 119 on Readers' Service Card

NEW DESAGA LAB SHAKER

Duplicates Hand & Wrist Motion A D J U S T A B L E

Between 80 and 140 Impulses per Minute

UNIQUE THREE-DIMENSIONAL PRINCIPLE ATTAINS MAXIMUM

AGITATION AND IMPACT INTENSITY

For additional information write:

Chemi Pharm Chemical and Pharmaceutical Industry Co., Inc.

9 0 W e s t B r o a d w a y N e w Y o r k 7 , Ν . Υ .

CONTRIBUTED ARTICLES

Radiochemical Evaluation of Fire Assay Method for Determination of Silver . G. H. Faye and W. R. inman 1072

Separation of Radium and Barium by Ion Exchange Elution 1077 W. H. Power , H. W. K i rby , W . C. McCluggage, G. D. Nelson, and J . H. Payne, Jr.

Radiochemical Determination of Uranium-237 . . . 1080 F. L. Moore and 5. A . Reynolds

Determination of Uranium and Beryllium in Fused F l u o r i d e S y s t e m s . . N. E. Rogers and W. D. Prather 1 0 8 1

Determination of Bromine in Uranium Fluorides and O x i d e s R. P. Larsen and N . M . Ingber 1 0 8 4

Precise Determination of Molecular Weight of Tri-nitrobenzene Complexes J. C. Godfrey 1087

Determination of Meprobamate in Urine. Appl i ­cability to Other Compounds Containing Ν—Η G r o u p G. H. Ellis and C. A . Hetzel 1 0 9 0

Polarographic Reduction of Nonconjugated Steroidal K e t o n e s . . Peter Kabasakat ian and James McGlot ten 1 0 9 1

Coprecipitation of Sodium in Sulfate Determination. Spectrographic Method J. L. Voth 1094

Controlled-Potential Coulometric Determination of Europium w. D. shuits 1 095

Determination of Alkanethiols in Hydrocarbons with Silver Ion and Dithizone 1 098 R. K. Kunke l , J . E. Buckley, and George Gor in

Determination of Ratio of Methyl to Phenyl Groups in Silicone Polymers 1 100 J. H. Lady, G. M . Bower , R. E. A d a m s , and F. P. Byrne

Colorimetric Determination of Boron with Victoria V i o l e t C. A . Reynolds 1 1 0 2

Direct Determination of Oxygen and Nitrogen in Titanium and Titanium Alloys. Use of Bromine T r i f l u o r i d e W . A . Dupraw and H. J . O 'Nei l l 1 1 0 4

Determination of Aluminum as Sodium Fluoaluminate H. W. Pender 1 1 0 7

Determination of Glycine in Glycine Potassium Tri-oxalatochromate(lll) G. H. Spauiding 1109

Chemical Microscopy of Isoquinoline. Identification

Of N o b l e M e t a l s H. F. Schaeffer 1 1 1 1

Microcrystalline Test for Osmium. . . H. F. Schaeffer 1112

Ultramicromethod for Assay of Pteroylglutamic Acid (Folic Acid) Activity 1113 W. N. Pearson, E. R. Brodovsky, E. R. Carnes, and W. J . Darby

Circle No. 131 on Readers' Service Card 6 A · ANALYTICAL CHEMISTRY