the Modern World (New York: The Free Press, 1967), p. 59. keit is of . . . period of progress.' A A 15. W. Grey Walter, The Living Brain (New York: W. W. Norton & Company, Inc., 1963), p. 148. ficeThe supreme abstraction . . . glimpses of itself.' A A A Kenneth M. Sayre, AcePhilosophy and Cybemetics,a in Frederick J. Cross