This book is dedicated to the memory of our dear friend Marthe Commissaire, for introducing my wife, Barbara, and me to the ancient cliff shelters and caves of France, where our prehistoric ancestors lived and loved and left their beautiful cave paintings

I also wish to thank hte following people: my wife, our children, John, Janet, and Catherine, for their love and encouragement.

.And for their friendship and help,

our good friend Ruth Beebe Hill;

my agent, Bernard Shir-Cliff;

and my editor, David Hartwell, London, 1890.