2 February 1973Vol. 179, No. 4072

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I did500radioimmunoassays

while I sleptThe big, 500-sample capacity of the LKB-WallacAutomatic Gamma Sample Counter means that you,too, could set up for long uninterrupted runs over-night or on weekends. Come back in the morning andfind a complete printout of results in digital form,with every sample positively identified. And withsample transfer taking as little as 10 seconds, youget fast results.

The LKB-Wallac Gamma Counter is simple to operate.You will be able to handle a high volume of samplesfor radioimmunoassays with a minimum of effort andat low cost. Samples can be added or removed fromthe counter at any time, without interrupting the run.They will always be positively identified. And youcan add a binary-coded cap when you need toidentify the samples of multi-users, or to give a

command to your computer to select a certain pro-gram for processing the data from a group ofsamples.Write now for information about LKB-Wallac GammaCounters for either 300 or 500 samples, with oneor two channels, for single cr dual labelled samples.

LKtB Instruments Inc.12221 Parklawn Drive, Rockville MD. 2085211744 Wilshire Blvd. Los Angeles Calif 900256600 West Irving Park Road, Chicago Ill. 60634260 North Broadway, Hicksville N Y 11801

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Armed with experience

In the cause of objectivityTwo of the three kinds of lighting are used in this ex-ample of medical photography: contour lighting toshow the well-developed arm and forearm, texturelighting to depict the characteristics of ichthyosis vul-garis. Flat lighting is the third kind, and just as im-portant in medical photography. Lighting is often thechief component of photographic style, but a glamor-ous photographic style is out of place in clinical pho-tography.Many shops that carry extensive lines of photographic

equipment and supplies stock the new KODAK Data Book"Clinical Photography" (cover price, $2.95). In a mere 118thoroughly illustrated pages it summarizes decades of per-sonal experience and consultation in the field by a recentlyretired Kodak man who once served his stint as presidentof the Biological Photographic Association. Assumingsome understanding of cameras and sensitized materials,he writes to would-be medical photographers and medicalpeople of all ages who strive to make the practice of medi-cine ever more objective.

Sharing chemical thoughtAsk ten reasonably alert citizens at ran-dom for their conceptions of what aresearch chemist does at work. Thenask ten research chemists how theyspend their working day. Compare.Note that the real eyestrain comes notfrom staring at test tubes and instru-ment dials but at publications, reports,and patents from other chemists.To reinvent the wheel is humiliating,

wasteful, and (if the patent on the par-ticular wheel hasn't expired) financiallyperilous. Hence the rise of chemicaldocumentation, an underappreciateddiscipline not lacking in intellectualchallenge of its own.As a major investor in chemical re-

search, Kodak does appreciate chemi-cal documentation and has also invested

quite a lot in the development of thatdiscipline. Our returns on the latter in-vestment safeguard our return on theformer. Our contributions to chemicaldocumentation stress "browsability"among structures. Superelegant, pre-cise computer output must serve merehumans whose ideas of what they aresearching for change even as theysearch.We see at least two ways this could

serve chemists other than our own orour industry's:

1. We are in the microfilm and mi-crofilm equipment business. Got it go-ing, in fact. Back then in 1928 it washardware and film. Nobody thought ofthem as mere tools of something called"information technology." Today in-formation technology has few worthiertasks than to keep chemistry from sink-ing of its own weight. Our thinking inthis direction has had to go deep be-

neath the generalities. It may be worthsharing.

2. We also conduct an entirely dif-ferent kind of business in custom pro-duction of compounds not generallyavailable beyond laboratory quantities.In serving prospective customers ofthat business, our chemical informationresources are no less important thanequipment and the skills to operate it.

Inquiries in either area can be addressedto Kodak, Dept. 55W, Rochester, N.Y.14650-the more specific the more wel-come. Requests merely to "send literature"will only mystify us.

\hy all microscopes will soon be square.

Right now you have your choice oftwo different types of microscope:round or square.

And in the last year or so, yourchoice of "squares" has been increasing.

For some very good reasons.Microscopes are no longer just

microscopes. They've becomesophisticated systems. Today, ourOrthoplan for example, consists of over1,000 components and accessories.

As the demand for specializedoptions has increased, it has becomeincreasingly difficult to fit the flatsurfaces of the various components tothe curved microscope stand. A solutionhas been the "adapter:" But this has onlybeen a short-range solution. And itcomplicates both fitting and maintenance.

In 1964, we took our first big steptowards a long-range solution to theproblem. It involved the introduction of acompletely new design. A design thatused straight lines instead of curves.A design that substituted a systematicbuilding-block approach for the jury-rigengineering of the past.

Since that time we have used thesame approach in redesigning our entireline of microscope stands, componentsand accessories. Today, every multi-component Leitz microscope system lookslike a single homogeneous instrument.Interchanging components and acces-sories is easier. And correct alignmentis assured.

The advantages of this new designare at long last beginning to attract somefollowers. And we predict that soon, youwill only have one type of microscope tochoose from. Square.

If you're considering a newmicroscope perhaps you should startwith the shape of the future. Not the past.

Write for a brochure. E. Leitz, Inc.Rockleigh Industrial Park, Rockleigh,New Jersey 07647.

LeitzsWhere most new developments start.

The old way: Use "adapters" to fitcomponents to curved stand.

zJThe new way: Start with a squareshaped stand and add squarecomponents.

Ifhe's not one ofour com-puter salesmen, that's the onething he probably won'tbringup.

Because he probably can'tbring anybody over to doit for you.

But we can.And we wilLAnd we'll bring over all the

modules (including specialmodules), labs, wire wrapservice, cabinets, hardware,assembled logic arrays, termi-nals and technicians it takes to

dothejob.For us it's easy, because our

Logic Products Group makes itall themselves, or gets whatthey need from one ofour othergroups, so it all fits togetherwhen it gets there.

When you buya computer

the hooker in the deal can be

"Who's going to hook it up?"

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We can do it because we'vehad, we've got, and we keepgetting the kind ofdesigners,engineers and logic people ittakes to make and market morekinds of computers, and every-thing it takes to make a com-

puterwork right, right fromthe start, than any other com-puter company in the world.We're the Logic Products

Group, Digital EquipmentCorporation, Maynard, Massa-chusetts 01754/(617)897-5111(Ext: 2785) in the U.S.

81 route de l'Aire, 1211Geneva 26/(022) 42 79 50in Europe.

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Conversations With Outstanding Scientists

Speakin of Science

The American Association for the Advancement of Science Is pleased to announce a new educatlonal resource for libraries andteachers of science. This provocative audiotape series should also be of Interest to the general public and to scientists who want toremain up-to-date on advances being made in other fields of science.

The first offering In this continuing series features 12 Informal conversations with more than 20 of America's leading scientists.These well-known men and women of science discuss The Mars Probe, Evolution and the Descent of Man, Advances In the PhysicalSciences, Advances in Astronomy, Peace, and seven other timely and important subjects.

The 12 recordings are on six cassettes (one complete 30-minute conversation on each side) for playback on standard machines. Theyare packaged in a compact binder that will fit easily into a bookshelf.

The conversations are narrated by Mr. Edward Edelson, science writer for the New York Daily News, and Mr. Mitchell Krauss ofWNET-TV in New York.

You are invited to purchase this new AAAS educational service at the low price of $39.95-AAAS member's price $34.95.

1. DISCOVERING MARSDr. Carl Sagan

(with Edward Edelson)

2. EVOLUTION AND THE DESCENT OF MANDr. Theodosius Dobzhansky, Dr. Ernst Mayr,

Dr. Elwin Simons(with Edward Edelson)

3. ADVANCES IN THE BEHAVIORAL SCIENCESDr. Eric Lenneberg, Dr. Ward H. Goodenough,

Dr. Lionel Tiger(with Edward Edelson)

4. WHAT IS NEEDED FOR PEACE?Dr. Chadwick F. Alger, Dr. Richard A. Falk,

Dr. George W. Rathjens(with Mitchell Krauss and Edward Edelson)

5. HEALTH CARE AND DELIVERYDr. Walter J. Lear, Dr. Paul Friedman,

Dr. H. Jack Geiger(with Edward Edelson)

6. ADVANCES IN THE PHYSICAL AND LIFE SCIENCESDr. Mark Kac, Dr. Charles Price

Dr. Charles P. Leblond(with Mitchell Krauss and Edward Edelson)

7. ADVANCES IN THE OCEAN SCIENCESMr. L W. Seabrook Hull, Dr. John L. McHugh

(with Edward Edelson)

8. PUBLIC UNDERSTANDING OF SCIENCEDr. Margaret Mead, Mr. Peter Hackes,

Dr. Paul B. Sears(with Edward Edelson)

9. TECHNOLOGY TODAYDr. Jack E. Goldman, Dr. J. Herbert Hollomon

(with Edwrd Edelson)

10. THE FINITE EARTHDr. Athelstan Spilhaus, Dr. Arthur Kantrowitz,

Dr. Daniel J. Fennell, Mr. Herman Kahn(with Edward Edelson)

11. ADVANCES IN ASTRONOMYDr. Herbert Gursky

(with Mitchell Krauss and Edwrd Edelaon)

12. NOISE AND MUSICMr. F. Richard Moore, Mr. Paul B. Ostergaard

(with Edward Edelson)

Money order or check payable to AAAS-No cash. Allow 3 to 4 weeks for delivery.

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Street

City State Zip

liii ~~~~~~~~~~~~~~~~~~~~~~~~~Send to-IAIAIAIS AMERICAN ASSOCIATION for the ADVANCEMENT OF SCIENCE F

1515 Massachusetts Avenue, N.W. Washington, D. C. 20005