QL_| 



The Beginnings of K^Z 



Embryonic Development l^S 



A symposium organized by the Section on Zoological Sciences of 

 the American Association for the Advancement of Science, co- 

 sponsored by the American Society of Zoologists and the Associa- 

 tion of Southeastern Biologists, and presented at the Atlanta Meet- 

 ing, December 27, 1955 



Edited by 



, Albert Tvler, R. C. von Borstel, and 

 ^^ Charles B. Metz 



Publication No. 48 of the 



AMERICAN ASSOCIATION FOR THE ADVANCEMENT OF SCIENCE 



Washington, D. C, 1957 



J 



