A\cknowledgments 
The author wishes to thank Professor Victor Goedicke, 
Dr. Paul Pickerel, Mr. William von Arx and Mr. Harry 
Campbell for reading the manuscript and offering many 
helpful suggestions. 
Thanks are also due to the following for material used in 
the book: 
Illustrations on pages 15, 22, 28, 44 and 65 are reproduced 
from The Oceans by Sverdrup, Johnson and Fleming 
through the courtesy of the publisher, Prentice-Hall, Inc. 
The underwater photographs on pages 26, 175 (top), 176, 
177, 178, 179, 180, 181, 182 and 183 were made by Dr. 
Maurice Ewing of Woods Hole Oceanographic Institution. 
The photographs on pages 138, 148, 151, 153, 156, 158 and 
160 are from the Yerkes Observatory. 
The American Museum of Natural History supplied the 
illustrations used on pages 165, 166, 167, 168, 169, 170, 171, 
172, 178, 174, 175 (bottom), 184, 185, 186, 187, 188, 189, 
190, 191, 192, 198, 194, 195, 196, 197 and 198. 
The labor of preparing this little book was very much 
lightened by the kind cooperation of the staff of Cornell 
Maritime Press, in particular that of Miss Frances A. Neal. 
HENRY STOMMEL 
