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National Geographic : 1974 Aug
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The meal that wasn't A SIX-INCH SOLE twitches fitfully on a red plastic line that holds it fast in midwater. Spying the tempt ing morsel, a shark arcs toward it menacingly and opens its jaws for the kill. But, suddenly repulsed and unable to snap its mouth shut, the predator torpedoes away in a frenzy -a s if from a deadly enemy. Why? The answer was recently discovered-with the aid of a Na tional Geographic grant-by Dr. Eugenie Clark, professor of zoology at the University of Maryland. After learning of the sole's repellent ability while doing research in the Red Sea, Dr. Clark pitted a sole (Pardachirus marmoratus) against two hungry reef sharks in a tank at the Heinz Steinitz Marine Biology Laboratory in Elat, Israel. Stringing the sole through the gills (above), Dr. Clark jerks the line to attract the sharks (right) that re peatedly approach with wonted vo racity, only to retreat swiftly. The reason: a strong toxin exuded from glands in the sole and picked up by the shark's acute senses-to its ob vious repugnance. Most effective chemical shark repellent known, the toxin may someday prove the salva tion of many a "man overboard." Invite your friends to take part in such important discoveries by nom inating them below for membership in the National Geographic Society. NATIONAL GEOGRAPHIC SOCIETY MEMBERSHIP cS C .cALENDARYEAR 1975 MEMBERSHIP DUES INCLUDE O..U SUBSCRIPTION TO THE NATIONAL GEOGRAPHIC ANNUAL DUES in the United States and throughout the world are $8.50 U. S. funds or equivalent. To compensate for additional postage and handling for mailing magazine outside the U.S.A . and its outlying areas, please remit: for Canada, $9.65 Canadian or U. S. funds; for all other countries, $11.00 by U. S. bank draft or international money order. 80% of dues is designated for magazine subscription. 18-MONTH MEMBERSHIP: Applicants who prefer delivery of their NATIONAL GEOGRAPHIC to start with the July 1974 instead of the January 1975 issue may upon request become members and receive the magazine for 18 months from July 1, 1974, through December 1975. Upon expiration, such memberships will be renewable annually on a calendar-year basis. For 18-month membership check here - and remit: for U. S. and its outlying areas, $12.25 U. S.funds or equivalent; for Canada, $13.95 Canadian or U. S . funds; for all other countries, $15.75 by U. S. bank draft or international money order. LIFE MEMBERSHIP is available to persons 10 years of age or older. The fee for U. S.(including its outlying areas) and Canada is $200 U. S .or Canadian funds; for all other countries, $250 by U. S. bank draft or international money order. NEW MEMBER PRINTNAME OF AN INDIVIDUALONLY (MR.,MRS..MISS) STREET CITY,STATE.ZIP CODE Mail to: The Secretary National Geographic Society Post Office Box 2895 Washington, D. C. 20013 CHECK ONE I WISH TO JOIN the NATIONAL GEOGRAPHIC E SOCIETY and enclose my dues $____ (FILLIN NAME AT LEFT.) (GIFT MEMBERSHIP) I nominate and enclose $ for dues of the person named at left. ii Send gift card signed: I NOMINATE for Society membership the person named at left. (Use separate sheet for additional nominations.) MY NAME PLEASEPRINT(MR., MRS.,MISS) STREET CITY.STATE.ZIP CODE 00874
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