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433. J. W. S. Pringle, Symposia Soc. Exptl. Biol. 7, 1 (1953).
433a. J. M. Lowenstein, Biochem. J. 70, 222 (1958).
433b. M. Calvin, Science 130, 1170 (1959).
434. F. Kutscher and D. Ackermann, Z. Biol. 84, 181 (1926).
435. N. J. Berrill, "The Origin of Vertebrates." Oxford Univ. Press, London and
New York, 1955.
436. G. Wald, in "Trends in Physiology and Biochemistry" (E. S. G. Barron, ed.),
p. 337. Academic Press, New York, 1952.
F. M. HUENNEKENS AND H. R. WHITELEY
433. J. W. S. Pringle, Symposia Soc. Exptl. Biol. 7, 1 (1953).
433a. J. M. Lowenstein, Biochem. J. 70, 222 (1958).
433b. M. Calvin, Science 130, 1170 (1959).
434. F. Kutscher and D. Ackermann, Z. Biol. 84, 181 (1926).
435. N. J. Berrill, "The Origin of Vertebrates." Oxford Univ. Press, London and
New York, 1955.
436. G. Wald, in "Trends in Physiology and Biochemistry" (E. S. G. Barron, ed.),
p. 337. Academic Press, New York, 1952.