296 W. V. MAYER AND S. BERNICK 



Acknowledgments. This research was supported, in part, by the United 

 States Air Force under Contract No. AF18(600)-843, monitored by the 

 Arctic Aeromedical Laboratory, Alaskan Air Command, Ladd Air Force 

 Base, Alaska. 



Contribution No. 94 from the Biology Department of Wayne State 

 University, Detroit, Michigan. 



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