THE
LABORATORY
THE NEW SERIES OF
LaMotte WATER SOLUBLE P H INDICATORS (Sulphon-phthalein)
pH 0.2—fl.r,
in Sparking Crystalline Form
SUPPLY CENTER
MOST COMPLETE LIST OF CARBON-14 LABELED COMPOUNDS AVAILABLE FROM ANY SOURCE!
"QUICKFIT"
Carbohydrates (uniformly labeled) · Amino Acids (specially and uniformly l a b e l e d ) Fatty acids (Ci to C u ) · Ring Labeled Aromatics · Organic Intermediates · Inorganic Compounds · Many other misc. compounds. Write lor complete C 1 4 List
Interchangeable Ground Glass Joints and High Vacuum Stopcocks
nvcfeer · tk/cago
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for Bulletin
and Price List
251 W. Erie Street, Chicago 10, 111.
II pays to standardize N e w , highly purified products, form ing instant solution w i t h distilled water. N o alkali t o be a d d e d — n o mfxing in m o r t a r — n o filtering—no waiting. Simply a d d t h e p r o p e r q u a n t i t y of t h e n e w L a M o t t e I n d i c a t o r t o distilled w a t e r i n d i l u t i o n flask a n d a brilliant solution of m a x i m u m sensi t i v i t y , s t a b i l i t y , a n d t i n c t o r i a l power results. Made exclusively by LAMOTTE
CHEMICAL
PRODUCTS C O M P A N Y Dept. A . C . Towson, B a l t i m o r e 4, M d . Catalog will be sent on request.
with "For better laboratory c o n t r o l "
"QUICKFIT"
M E T H Y L - P U R P L E the spectacular green-gray-purple titration indicator (pH r a n g e 5.4-4.8) ACCURATE SENSITIVE DEPENDABLE
ROCHESTER SCIENTIFIC CO. P. O . Box 163 Rochester Ι , Ν . Υ .
Cited in the literature for the most accurate and rapid determination of borates, hydrazine, mixed phosphates, nitrosen (Kjeldahl), alkalinities, etc.
o-p-FLUOROPHENOL p-NITROFLUOROBENZENE
Stocked by most laboratory supply firms
DIHYDR0XYACET0NE
Write for 8-page descriptive folder FLEISHER Box 616
CHEMICAL CO. Washington 4 , D. C.
CUSTOM CHEMICAL LABORATORIES 2 0 5 4 N . Cicero A v e . , Chicago 3 9 , I I I .
COMPLETELY
AUTOMATIC TITRATION with
your
present
p H meter
U / D I T F INTERNATIONAL INSTRUMENT CO. w m l L CANYON, CALIFORNIA
' W»"uMKi'H f «ESfAUCH {FOUNDATION •
QUANTITATIVE MINERAL | ANALYSES INCLUDING
S O D I U M A N D FLUORINE Proximate analyses · Vitamin
and amino acid assays * Screening of compounds for insecticidal, fungi
INFRA-RED Variable
CELLS
for
liquids
New and improved design
cidal, and bactericidal properties PROJECT RESEARCH AND CONSULTATION Write for WISCONSIN ALUMNI price X X i * RESEARCH FOUNDATION P.O. BOX 2059-C · MADISON 1, WIS.
Literature on request
RESEARCH & INDUSTRIAL INSTRUMENT CO. 6 2 2 9 N . 18th St., Arlington 5, V a .
CLARK Model 3001 Stirrer, air driven, explosion proof, 1 / 6 HP, zero to 6000 RPM, complete with rubber tubing connector, silencer, collect chuck, support rod; 12" shaft and two inch propeller of stainless steel. Price $45.00
GRENCO, INC. Box 417
Pale» Heights, Illinois
MICROANALYTICAL LABORATORY Routine analyses in one week CH, N , S, Halogen, Fluorine, Active Hydrogen, Alkoxyl, Alkimide, Acetyl, Terminal Methyl, etc. Identifications and minor research problems by specialists in organic microehcmical analysis. Howard S. Clark, Director P. O . Box 17 Urbana, III.
YOUR ANNOUNCEMENT of Equipment Sale
Professional carry
lisco STOPCOCKi for Micro Apparatus
Interchangeable* plugs
·
Precision made
Many types available
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for
details
MICROCHEMICAL SPECIALTIES CO. 1834 UNIVERSITY AVE. · BERKELEY 3, CALIF.
Standardized ALUMINA "Woelm" For
Chromatography
Acid, Non-alkaline, Basic Highest activity, g r a d e I Packings: 100 g, 5 0 0 g, 1 0 0 0 g, 5 0 0 0 g W e invite your inquiries A L U P H A R M CHEMICALS Sole Distributors in USA Sales Office: 5 4 C Street ELMONT, L. I., N.Y.
or Chemicals for
and/or
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readers
Wanted,
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ANALYTICAL CHEMISTRY Advertising Office: 3 3 0 West 4 2 n d Street N e w York 3 6 , Ν . Υ .
