. Hudson Hoagland, “The Brain and Crises in Human Values,”Zygon (June 1966), pp. 140–57. Since this summary is very brief, the reader who has not read the earlier paper may wish to do so because of its importance for the present thesis.

. John Paul Scott, Animal Behavior (Chicago: University of Chicago Press, 1958), pp. 175, 177.

. New York: Atheneum Publishers, 1961.

. Hudson Hoagland, “Mechanisms of Population Control,”Daedalw (Summer, 1964), pp. 812–29.