CColemon Jr. (MODEL 6) - Easy to Us. . . . Safe in any laboratory. The ColemanA Flame Photometer is as safe and easy to use as a BunsenSPECTROPHOTOM ETER burner. Flame will not blow out or flashback, and pressure

adjustments are not critical.rot iai.la, iou, anialysis, coriiroe ana researcn wnereonly spectrochemistry is worked. Complete with plasticlight shield, mounting pads, transmittance-density scale,operating directions and constant voltage transformer. Foruse on 1 10-120 volts. 60-cycle. A.C. only.

$460

A Coleman Universal (MODEL 14)SPECTROPHOTOMETERA multi-purpose instrument for spectrochemistry that canbe adapted for photofluorometry, nephelometry and sectroand electro titrations. Supplied with top-carrier, filter,transmittance-density scale, mounting pads, operating di-rections and constant voltage transformer. For use on110-120 volts, 60-cycle. A.C. only.

Lowest Cost . . . Highest Value . . . The Coleman FlamePhotometer is ready to operate with any modern ColemanPhotometer . . . Junior Spectrophotometer, UniversalSpectrophotometer, Electric Colorimeter, Photo-Nephelom-eter or Nepho-Colorimeter.

For users who prefer to conduct flame analysis independentof other procedures or who do not have available one ofthe above Coleman instruments, a separate indicatinginstrument . . . the Coleman Galv-O-Meter is offered.

Flame Photometer ...... ea. $450.00Galv-O-Meter .......... ea. $150.00

AV

COLEMAN FLAMEPHOTOMETERMeasures Sodium, Potassium AND CALCIUM directly,

easily and accuratelyNew and Exclusive Atomizer-Burner . . . Burns commonilluminating gas or propane with oxygen for a stablehigh-temperature flame. No explosive tank gas required.Safe in the most inexperienced hands.

Simple Direct-Coupled Optics . . . No slits to adjustno mirrors or prisms to align. Optical filters provide spectralisolation.

Direct Reading . . . Without internal standards. Hightemperature flame gives full excitation . . . eliminatesneed for chemical additives such as lithium.

FISTER'S MANUAL OF STANDARDIZEDPROCEDURES FOR SPECTROPHOTOMETRICCHEMISTRYContains 224 METHODS for the determination of 115SUBSTANCES in various biological fl'uids. Includes 115CALIBRATION CURVES and 6 CHARTS. 339 TESTS can beperformed from the 728 PAGES of this manual that willpay for itself many times over.

$30.00THE COMBINATION OF A COLEMANSPECTROPHOTOMETER PLUSFISTER'S MANUALassures the user the most accurate and simplest waypossible to achieve the ultimate results in clinical chem-istry. Ten years of analytical procedures have been builtaround the Coleman Spectrophotometers-ten years ofservice have proved their ability to increase output andto lower costs in the laboratory!

WRITE FOR DESCRIPTIVE BULLETINS.>.>.¢C::>,%.'i:MS::'.¢::'.gS.>.::F:.P.B:>.::B. ~ ~~ ~ ~ ~ ~ ~ ~ ~ ~ ~~ o;:::Yf:S:

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SCIENCE is published weekly by the AAAS, 1515 Massachusetts Ave., NW, Washington 5, D.C. Entered at the Lancaster, Pa., Post Office as second classmatter under the act of 3 March 1879. Annual subscriptions: $7.50; foreign postage, $1; Canadian postage, 50e.

Things don't stick to a

coated surface

Water dirt blood stains or any liquid

are repelled by a SILICLAD coated surface.

SILICLAD is a water soluble silicone concentrate that

can be used on glass, ceramics, metal, rubber and

plastic materials.

A quick dip in a 1% water solution leaves a tough,

liquid-repellent coating of silicone on the glass orceramic surface. A water rinse completes the job. no

baking necessary.

SILICLAD-treated objects are easier to clean and

scratch and abrasion-resistant. Breakage and chippingof expensive glassware pieces are reduced.

Surfaces drain completely when SILICLAD coated.no more clinging drops of liquid.

Try SILICLAD yourself on flasks, beakers, graduates,stoppers, burettes, pipettes, bottles, catheters, tubing,

blood apparatus . . oand be convinced. SILICLAD isnon-toxic, non-irritating, long-lasting.

4 ounces of SILICLAD concentrate (makes up to 25pints of working solution) $3.501 dozen 4-ounce bottles $36

Available at your local supply dealer

CLAY-ADAMS, INC., New York 0

GYROTORY SHAKERModel S-3

A SMALL MACHINE with LARGE CAPACITYPositive, uniform rotary motionContinuously variable speed

Automatic TimerInterchangeable platforms

Clamps for all sizes of Erlenmeyer flasksSpecial holding devices to specifications

Precision-built for continuous heavy duty serviceUNCONDITIONAL ONE YEAR GUARANTEE

NEW BRUNSWICK SCIENTIFIC CO.,.,.,~X

tUlt~ P;.BO 6D NE _IUSIK N.J.._!^1@i ii -

BRINKMANN

_ ~~EXPOSUaRE METERSFOR PHOTOMICROGRAPHYAND CINEMICROGRAPHY

ARE BUILT INTO THE CAMERA FOR MAXIMUMUTILIZATION OF AVAILABLE LIGHT AND

CONVENIENCE

EXTERNAL CELLS ALSO AVAILABLE FORLEITZ, ZEISS, B&L, KINEEXACTA

AND OTHER MAKES

BRINKMANN INSTRUMENTS, INC.376-380 GREAT NECK ROAD GREAT NECK, L. 1., N.Y.

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SCIENCE, VOL. 1241056