Photomicrograph byJuliuos Wbbr

Lookto Nikofl $ ^ ¢ b,,t, $ + ^ t f̂A BlickenSie aufNikonSince man discovered that sunlight ^ . C >a SeitdemderMenschentdeckte,daBcdasfocused through a lens created fire, t R, , 4 L R0 , durch den Brennpunkt der Linse gesam-control of the path of light has become LA 6 gt. l melte Sonnenlicht Feuer erzeugt, wurdeone of man's greatest tools. Today aL i s* die KIntrole des Strahienep ucneni'~ ~,, dergroBten Werkzeuge des Menschen.technological man uses optics to see -t T 01 Heutebedientsichdertechnologischewhathehasneverseenbeforeandto - s 7 t 8 t' 9 J t *Mensch der Optik, umdaszusehen, wasmeasure with a precision he has never -9 aN 0 er nie zuvor erblickt hatte und um mit

Nikon leds the wy ~~. ~'~c L U ~. einrPram-sionzumessn,dieernohibefore achieved. Nikon leadstheway L t 'z 0911Tt' p erreicht hatte. Nikon ist fiihrend inwith innovative optical instruments _ t 415 * > ?2 7°* neuesten optischen Instrumenten fur diefor the specialized needs of industry J ±I lEiEt -41 r SonderbedurfnissederIndustrieundand science, from aerospaceto t E t P WissensthaftvonderRaumfabrttechnikoceanography. Forall that is new, £#ie .t> dR Gg * * X § biszurOzeanographie.UmalldasuzulooktoNikon. F L1 tat isnV sehen,wasesNeuesgibt,richtenSiel n Ihren Blick auf Nikon.Nik/* Nikon Inc., lnstrument Division, Ehrenreich Photo-Optical Industries, Inc., Garden City,New York 11530U.S.A.

TIAA-CREF

Retirement XAnnuities _

for tax-deferredannuity programsSupplemental Retirement Annuities (SRA's) are new forms of TIAA and CREF contractsdesigned expressly for use by persons who want to set aside tax-deferred retirementfunds over and above amounts being accumulated under their institution's basicretirement plan. They are available for employees of colleges, universities, private schoolsand certain other nonprofit educational organizations with tax-deferred annuity(salary-or-annuity option) programs. Through a properly drawn agreementwith their institution, staff members may divert part of their compensation beforetaxes to the purchase of these new contracts.

And SRA's are cashable at any time. This means thatif the money accumulated by salary reduction is needed before retirement, the SRAcontracts can be surrendered for their cash value. Benefits, whether payable in cash oras income, are taxable as ordinary income when received.

For more information and answers to questions send for your copy of the booklet onSupplemental Retirement Annuities.

r m - - m - -

I Send me a booklet describingTIAA-CREF Supplemental Retirement Annuities.

I NameI Dateof Birth

Address _ ____I

: NonprofitEmployer

Street

City State Zip

I

III

I Teachers Insurance and Annuity Association wi730 Third Avenue, New York, New York 10017

L - - - - - - - - - - Wsj9 DECEMBER 1977 991

It steals every scene and autographs it.Photomicroscope Ill...the fully automatic superstar.Fully automatic built-in 35mm camera for stability, com-

pactness, and convenience.Fully automatic integrated computer flash to solve vibra-

tion, reciprocity and color problems.For polarized-light and fluorescence work, 98% of the

light can be directed onto the film.Largest selection of illumination and other equipment

for all techniques in both transmitted and incident light.Acceptance of photometers, TV, projection screen, other

format cameras-while keeping full 35mm camera capability.

Now another first- new film codifier.The Photomicroscope has been making photomicro-

graphic history for 20 years - and is now recording eventseven more efficiently and reliably. The new film codifier at-tachment leaves your mark on each exposure.

Now you can identify every frame with up to 5 symbols,letters and/or automatically successive numerals regardlessof the length of time your specimens are exposed.

Contact us for the complete story or a demonstration.

Nationwide Service

Carl Zeiss, Inc., 444 5th Avenue, New York, N.Y. 10018 (212) 730-4400. Branches in:Atlanta, Boston, Chicago, Columbus, Houston,Los Angeles, San Francisco, Washington, D. C. In Canada: 45 Valleybrook Drive, Don Mills, Ont., M3B 2S6. Or call (416) 449-4660.

LE T[ tS UP

tEuERDRs DOwI

dLI,

I

If you ever have an equipment breakdown...

be

In

You should seldom have to make use ofthis Heinicke Minute Man service, sincewe build laboratory instruments to work,and to last. But it's good to know that westand back of them... all the way.No more letter writing and waiting.

Just pick up a phone and dial the toll-

free number, 800-327-9783. We'll dis-patch a Minute Man no matter whereyou are in the continental United States.He'll either fix the trouble on the spot, ordiagnose it and arrange for factory ser-vice. You'll pay only the normal cost forservicing.

a0 Heinicke and NAPCO laboratoryMinute Man service policy extends to all equipment have been the standardHeinicke and NAPCO®equipment. Remember of quality in the field for a gener-a-tion. Now, with Minute Man service,

this toll-free numbe r800-327-9783 they represent the complete packagethis toll-free number ouu-o { -:7 1ov of performance and satisfaction.

HEINICKE INSTRUMENTS COMPANY 3000 Taft Street. Hollywood. Florida 33021NATIONAL APPLIANCE COMPANY 800-327-9783 * (Florida) 305-987-6101

Circle No. 162 on Readers' Service Card9 DECEMBER 1977 1073

NewNeurochemicals[N-methyl-3H ] Diazepam30-6OCi/mmol TRK.572

[2-14C]Diazepam40-6OmCi/mmoI CFA.591Amersham now offers two radioactiveforms of one of the most widely used drugsin medicine. High affinity receptors fordiazepam have recently been discoveredin brain tissue. Diazepam is also known asValium""**Valium is a trademark of Hoffman-La Roche, Inc.

0>AmershamAMERSHAM CORPORATION:A SUBSIDIARY Of THE RADIOCHEMICAL CENTRE

2636 S. Clearbrook Dr., Arlington Heights, IL 60005312/593-6300 or 800/323-9750 (Toll-free)

In Canada505 Iroquois Shore Rd., Oakville, ONT L6H 2R3416/842-2720 or 800/261-5061 (Toll free)

CircleINo.193 on Readers' Service CardCircle No. 193 on Readers' Service Card

"OPTO-VARIMEX"wUltimate Animal ActivitY Meter

DIGITALLY MEASURES TRAVELEDDISTANCE, PLOTS PATTERN OFMOVEMENTS..MeasuresAnimalRespirationand Tremors

* Measures horizontal activity by interruption ofinvisible infrared beams criss-crossing animalcage 1" above the bottom.

* Measures rearing and jumping activity by meansof two adjustable light curtains.

* Plots pattern of animal movements on X-Y chartrecorder by decoding position of animal frominterrupted IR beams.

* Completely insensitive to urine bedding or fecesas IR beams cross the cage 1" above bottom.

* Large 15" x 15" transparent plastic cage-notattached to the instrument.

* Measures tremors and respiration by proximitysensor.

for more information call or write:COLUMBUS INSTRUMENTS

950 NORTH HAGUE AVENUECOLUMBUS, OHIO 43204, U.S.A.

PHONE (614) 488-6176Circle No. 163 on Readers' Service Card

Circle No. 140 on Readers' Service Card9 DECEMBER 1977 1075