TOM SWIFT AND THE ELECTRONIC HYDROLUNG [Illustration: _The grenade went streaking straight toward Tom!_] THE NEW TOM SWIFT JR. ADVENTURES TOM SWIFT AND THE ELECTRONIC HYDROLUNG BY VICTOR APPLETON II ILLUSTRATED BY CHARLES BREY NEW YORK GROSSET & DUNLAP PUBLISHERS Copyright BY GROSSET & DUNLAP, INC., 1961 [Transcriber's note: Extensive research did not uncover any evidence that the copyright on this publication was renewed.] ALL RIGHTS RESERVED PRINTED IN THE UNITED STATES OF AMERICA CONTENTS CHAPTER PAGE 1 PIRATE MISSILE 11 2 UNDERSEA SURVEY 20 3 INVISIBLE SUB 31 4 AERIAL ATTACK 39 5 A HUNCH PAYS OFF 50 6 THE CAISSON CLUE 56 7 PORPOISE TAG 64 8 DATE TROUBLE 72 9 A MAGNETIC KIDNAPING 81 10 TELEPHONE CODE 90 11 SQUARE-DANCE HOAX 100 12 DETECTION TEST 109 13 ENEMY FROGMEN 119