WALTER J . M U R P H Y , EDITOR Editorial Assistant:
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G. GLADYS GORDON
ISSUED SEPTEMBER 17, 1943 Manuscript
Assistant:
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VOL. 15, NO. 9
STELLA ANDERSON
Make-up
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CONSECUTIVE NO. 18
Assistant:
CHARLOTTE C. SAYRE
Advisory Board B. L. CLARKE T . R. CUNNINGHAM
G. E . F . LUNDELL M. G. M E L L O N
R. H. M Ü L L E R H . H . WlLLARD
Mass S p e c t r o m e t e r a s A n a l y t i c a l Tool H. W. Washburn, H. F. Wiley, a n d S. M. Rock 541
S i m p l e Device for Preparing Vapor-Air Mixtures . . J. Brennan Gisclard 582
Analytical C h e m i s t r y of Rare Earths G. L. Barthauer, R. G. Russell, and D. W. Pearce 5 4 8
S y s t e m a t i c Polarographic Metal Analysis James J. Lingane 5 8 3
P o t e n t i a l Service Performance of Lubricating Oils . George W. Waters and Elder C. Larson 550 Coprecipitation of C h r o m a t e w i t h B a r i u m Sulfate . William B. Meldrum, William E. Cadbury, Jr., a n d Clark E. Bricker 560 Moderately Large Extractor-Percolator A s s e m b l y . Francis A. Gunther 562 Q u a n t i t a t i v e D e t e r m i n a t i o n of B e n z e n e i n Presence of Cyclohexane Richard L. Bishop and E. Louise Wallace 5 6 3
Apparatus for Q u a n t i t a t i v e Catalytic Hydrogénation Lloyd M. Joshel 590 Photoelectric P h o t o m e t e r for D e t e r m i n i n g Carbon Disulfide i n A t m o s p h e r e . . . Shirleigh Silverman 592 Yolk N o m o g r a p h for M a y o n n a i s e a n d Salad Dressing D. S. Davis 5 9 5 Improved S t e a m - D i s t i l l a t i o n Apparatus C. V. Bowen and W. F. Barthel 596 MICROCHEMISTRY D e t e r m i n a t i o n of Mercury i n Rubber C. L. Luke 597
D e t e r m i n a t i o n of Surface Oxidation of B i t u m i n o u s Coal . . . . John A. Radspinner and H. C. Howard 566 D e t e r m i n a t i o n of H a l o g e n i n Organic C o m p o u n d s . Paul K. Winter 571 D e t e r m i n a t i o n of Sulfur R e s i d u e s from Sulfur Application o n Citrus Foliage F. A. Gunther, R. L. Beier, a n d J. P. LaDue 574 R e d u c t i o n s w i t h N i c k e l - A l u m i n u m Alloy a n d A q u e o u s Alkali Erwin Schwenk, Domenick Papa, and Helen Ginsberg 576 Analysis of E t h a n o l for Minor A m o u n t s of Esters and A l d e h y d e s . Frank M. Biffen and Foster Dee Snell 577 R e m o v a l of Air from Powders i n D e n s i t y D e t e r m i n a tion Ernest L. Gooden 5 7 8 D e t e r m i n a t i o n of S u g a r s i n Apple T i s s u e R. H. Leonard, R. C. Meade, and R. B. Dustman 579
B e n z o i n as Fluorescent Qualitative Reagent for Zinc . . . Charles E. White and M. H. Neustadt 599 Semimicrodetermination of P h o s p h o r u s i n Organic C o m p o u n d s Miriam D. Bachofer and E. C. Wagner 601 D e t e r m i n a t i o n of Total Sulfur i n Rubber . . . . C. L. Luke 602 D e t e r m i n a t i o n of C o m b i n e d F o r m a l d e h y d e i n Organic C o m p o u n d s a n d i n Cellulose F o r m a i s Carroll L. Hoffpauir, G. Warren Buckaloo, and John D. Guthrie 605
NOTE ON ANALYTICAL PROCEDURE Stability of N i c k e l o u s - A m m o n i a Color S y s t e m . . J. P. Mehlig and R. E. Kitson 606 NEW EQUIPMENT
607
BOOK REVIEWS
608
The American Chemical Society assumes no responsibility for the statements and opinions advanced by contributors to its publications. 28,700 copies of this issue printed. Copyright 1943 by American Chemical Society. Published by the American Chemical Society at Easton, Penna. Editorial Office: 1155 16th Street, N. W., Washington 6, D. C.; telephone, Republic 5301; cable, Jiechem (Washington). Business Office: American Chemical Society, 1155 16th Street, N. W., Washington 6, D. C. Advertising Office: 332 West 42nd Street, New York 18, Ν. Υ.; telephone, Bryant 9-4430. Entered as second-class matter at the Post Office at Easton, Penna., under the Act of March 3, 1879, as 24 times a year—Industrial Edition monthly on the 1st, Analytical Edition monthly on the 15th. Acceptance for mailing at special rate of postage provided for in Section 1103, Act of October 3, 1917, authorized July 13, 1918. Remittances and orders for subscriptions and for single copies, notices of changes of address and new professional connections, and claims for missing numbers should be sent to the American Chemical Society, 1155 16th Street, N. W., Washington 6, D. C. Changes of address for the Industrial Edition must be received on or before the 18th of the preceding month and for the
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