ACKNOWLEDGMENTS 



To my daughters, Lydia Chichester du Pont and 

 Alice du Pont Mills, who first showed me the bottom 

 of the sea. 



To Mrs. Howard F. Callaway for many suggestions 

 in the preparation of these pages. 



To Richard C. du Pont for keenly relating his ex- 

 periences. 



To John Dick for getting the best out of photo- 

 graphs that were taken with no intention of publi a- 

 tion. 



To E. R. Fenimore Johnson, who kindly made the 

 frontispiece for this book. 



Cvii] 



