350 
Psyche 
[December 
am also grateful to my wife. Elf ie, for her collaboration and to Mr. 
J. M. Reichson for his help and advice rendered during the present 
study. This work was supported by grants from the Swiss National 
Science Foundation (Fellowship 1967), Stiftung fur biologisch- 
medizinische Stipendien (Fellowship 1968) and the U.S. National 
Science Foundation (Grant No. GB 7734, E. O. Wilson, Sponsor). 
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