THE NATURAL HISTORY LIBRARY makes available in 

 paperback format books of enduring interest in 

 the life and earth sciences. Published in co- 

 operation with The American Museum of Natu- 

 ral History by Doubleday Anchor Books, this 

 series introduces the student and the general 

 reader to the study of man— his origins, his na- 

 ture, and his environment— and to the whole 

 natural world, from sub-microscopic life to the 

 universe at large. 



The series is guided by a board at The Ameri- 

 can Museum of Natural History consisting of: 

 Franklyn M. Branley, Associate Astronomer, De- 

 partment of Astronomy; Charles M. Bogert, 

 Chairman and Curator, Department of Herpetol- 

 ogy; E. Thomas Gilliard, Associate Curator, De- 

 partment of Ornithology; Gordon F. Ekholm, 

 Curator of Mexican Archaeology, Department of 

 Anthropology; and Bobb Schaeffer, Curator, De- 

 partment of Vertebrate Paleontology. 



