rson and speed of the Mettl P120b for student use in basic chemistry. It-teWork of two modern single-pan analyC.iaL

SPEED - a single weighing takes Xonly-aVfonds. A filling line indicator eliminate"sintrtions in weighing out materials. Fasterfwei-give students more time for actual Iabora*o wOSIMPLICITY - just load the pan and read-therhsuit. Students learn to use it in just a fewm1nu-teECONOMY - high output of work makes it moreconomical, on a cost per student basis, than amodern analytical balance.RUGGEDNESS - stands up to continuous classroomuse, delivering hundreds of thousands of weigh<ings with unequalled speed and precision. No spe-.cial weighing room needed.PRECISION - provides readability direct to one mil-ligram and precision better than 0.5 mg, realis-

r,ow=

Looking into Microtome Cryostats?a' 8e

It

CTD

c has three viewpoints for you.The CTD - World's Standard CryostatIf your needs are for routine sectioning, space saving andeconomy, the CTD is ideal at $1645.

This is the famous IEC Microtome-Cryostat that revolu-tionized frozen sectioning techniques. From tissue to slidein 3 minutes vs. hours for paraffin methods. Model CTDis compact, low priced, ideal for routine sectioning. Itfeatures: ±1O C temp. control; internal quick freezing; aMinot Custom Microtome.

This exceptional microtome is ideally designed forfrozen sectioning. It has few moving parts. A precisionscrew drive gives it a high order of accuracy. A ball andsocket holder quickly orients the specimen to the knife.A simplified anti-roll device assures a uniform, continuousribbon of tissue. Tough tissue won't pull or snag. It usesany standard knife and cuts routinely from 2-16 microns.This microtome is 100% rustproof. You can put it in asink and clean it with scalding water. And it does doubleduty too - in addition to frozen sectioning the MinotCustom Microtome handles paraffin work with equal ease.

The CTI - A Compact Research CryostatIf your needs call for routine sectioning plus researchwork, the model CTI is a superior and economical choiceat $1990.00.

This new, compact, advanced microtome cryostat isideally suited for both research work and routine frozensectioning. It features: -1- C Temp. control; an internal

quick-freeze block; a vacuum port for freeze drying. Quickdefrost. Tissue to slide takes less than 3 minutes. Numer-ous other features and accessories. Of course the famousMinot Custom Microtome is standard equipment.

The CTR - A Complete Sectioning WorkshopThe model CTR is the world's finest frozen sectioningworkshop. Price: $2490.00.

In this advanced research model microtome cryostat'everything necessary for preparation, cutting, stainingand examination of frozen sections can be done from oneseated position, making the CTR the ultimate refinementin cryostat microtomy. Cold control to ±+10 C. Tissue toslide in three minutes or less. Vacuum port for freezedrying techniques. Equipped, of course, with the superbMinot Custom Microtome.

Other facts to considerFact: The first open-top cryostat was made by IEC, theexperienced company in the field. Fact: There are moreIEC Microtome-Cryostats in use than any other, literally,thousands. Fact: IEC-sponsored research made routinefrozen sectioning practical and produced a definitive docLI-ment on the technique. * Fact: The famous IEC MinDtMicrotome, standard on each model, is the only micro-tome ideally designed for frozen sectioning. Fact: OnlyIEC offers you a complete instrument family from whichyou can best fill your particular needs, workload andbudget. Write for Bulletin CT for complete details.*Copy available on request

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SCIENCE, VOL. 1501210

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1244

has not closed his eyes. Instead, weare given an irrelevant (in this con-text) record showing that the firsttwin's eye closure did not influencealpha in an unrelated subject....

VICTOR G. LATIESBERNARD WEISS

University of Rochester School ofMedicine and Dentistry,Rochester 20, New York

References

1. J. B. Rhine and J. G. Pratt, Parapsychology:Frontier Science of the Minid (Thomas, Spring-field, Ill., 1957), p. 32.

2. 1. Osward, Sleeping and Waking (Elsevier, Am-sterdam, 1962), pp. 72-73.

3. H. Davis and P. A. Davis, Arch. Neuirol. Psy-chiat. 36, 1214 (1936).

The report of Duane and Behrendt... has so heated the mail to my usuallyquiet ivory tower that I now needinsurance. One nonparascientist evenasked: "Ought I not to resign from theAAAS?" Should the editors have ac-cepted this paper? The pro answer is:Galileo. Science is hindered when theEstablishment undertakes censureship.The contra answer is: Space is tooprecious nowadays to allow for theprinting of raw data, and these data areraw, for they state merely an empiricalrelation, an empty correlation, that liesout of further relation to any under-stood body of scientific fact. Besides,there is a literature which these authorsdo not cite and seem not to know. Itseems clear that Soal's marvelous Welshschoolboys connived by what now seemsclearly to have been trickery to foolmany important investigators [S. G.Soal and H. T. Bowden, The MindReaders (London, Faber and Faber,1959)]. Those boys were in separaterooms. How well shielded were thetwins of Duane and Behrendt fromeach other? Did the recipient twin havehis eyes continuously open or continu-ously closed? Could he have knownwhen the sending twin was asked toclose his eyes? Identical twins are ac-customed to cooperate, and these twinswere the only ones who knew the biol-ogy of what was going on. Anyhow,the major difficulty is that these twins(two out of 15 pairs) presented the ex-perimenters with a correlation that theycould not explain. So it has alwaysbeen. The parascientist (as does hiscomplement) pits his ingenuity againstthe inscrutability of nature, and whenthe parascientist fails he has succeeded,for he has discovered the inexplicable!

EDWIN G. BORINGHarvard University,Cambridge, Massachusetts

Evolution in Tennessee

In his letter headed "After Scopes"(22 Oct., p. 435), Thomas A. Cowanremarks, "Apparently no one else inthe State of Tennessee has cared sincethe trial to challenge the constitution-ality of the [anti-evolution statute]."No one, to my knowledge, has broughtthe matter to the state Supreme Court,but there has been concern about theissue. Around 1960, Arlo I. Smith leda group of professors, business lead-ers, and clergymen in appealing to theTennessee legislature to remove thisunfortunate law from the statutebooks. The legislative committee con-cerned refused to act, and consequent-ly the matter was never brought tothe floor of the legislature. Yet thoseof us who are native Tennesseans maystill hope that the Renaissance willsome day reach Tennessee.

KENNETH R. BARKERDepartment of Zoology,University of Texas, A ustin 78712

Cowan's letter implies that the the-ory of evolution is not being taughtin state-supported schools in Tennes-see. This is not true. At the Universityof Tennessee this subject is includedin general zoology and botany courses,and courses on evolution and specia-tion are being taught at the upper-division and graduate level; this hasbeen true for many years. I have madeno survey to determine the extent towhich evolution is taught within thestate, but I know that the subject isincluded in courses in other state-sup-ported universities and colleges andmany of the textbooks used in highschool biology courses.One reason the statute has not been

repealed is that it has so commonlybeen disregarded.

JAMES T. TANNERDepartment of Zoology andEntomology, University of Tennessee,Knoxville 37916

Help Sought with History

I am writing a history of the Huxleyfamily, which is to be published in theUnited States and Britain next year,and would be grateful to hear fromanyone who has recollections or remi-niscences of in,terest.

RONALD W. CLARK +

10 Campden Street,Kensington, London, W.8

SCIENCE, VOL. 150

.4

0.001 aRESOLUTION

'

throughout0.000 to 2.000ABSORBANCE

RANGE lI

..with the Gilford Model 30MICRO-SAMPLE SPECTROPHOTOMETERThis instrument maintains a usable resolution of 0.001 absorbance unit over

- its entire measurement span of 0.000 to 2.000 A units. Its long term stability isbetter than 0.005 A per hour, requiring only occasional zero setting on a reference.And it combines this uncommon performance with explicitly simple operation.The automatic time-impulse sampling system draws in less than 0.5 ml per samplewith no handling of cuvettes or pouring of fluids. Touch a bar, and in a fewseconds you flush out the previous sample, then introduce the next. The absorb-ance value appears inimediately on the four-digit numerical indicator. Or, aftera single calibration setting, you get direct readings of concentration in anyconvenient units.Technicians find the compact Model 300 especially easy to use and maintain. Yet,here is a true spectrophotometer with research accuracy and flexibility, fillinga realistic need in busy laboratories.The remarkable sensitivity and stability of the Model 300 is a product of aunique electronic circuit, sophisticated optical and mechanical design and closetolerance manufacturing.For special applications there are accessories for continuous flow arrangements,use of standard cuvettes and chart recording of absorbance data.As vital diagnostic and research techniques improve, measurements oftenrequire new orders of sensitivity, precision and speed. The Gilford Model 300is clearly ahead of this trend.Gilford Instrument Laboratories Incorporated * Oberlin, Ohio 44074

I STRUMENT,1248

SCIENCE, VOL. 150