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IX. ACKNOWLEDGEMENTS The author is indebted to Drs. G. P. Kuiper, Joshua Lederberg, H. J. Muller, and L. Reiffel, and to Lynn Sagan, for suggestions and constructive criticism; to Drs. James Crow, A. G. Marr and Robert E. Wilson for clarifying certain points; to Drs. W. Groth and S. Zamenhof for information about their recent experiments in advance of publication; and to the Armed Forces - National Research Council Committee on Bio- Astronautics for supporting the final preparation of this monograph. Most of the work was performed while the author was at Yerkes Observatory, University of Chicago, and Physics Research Department, Armour Research Foundation, Chicago. 42