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Published online by Cambridge University Press: 03 June 2021
1 The place (but not the page) of original publication is indicated by prefixed letters in this column: a, Science, v.113, p. 111-120, 1951; b, ibid., v. 114, p. 291-296, 1951; c, ibid., v. 116, p. 673-681, 1952; d, ibid., v. 119, p. 135-140, 1954; e, ibid., v. 120, p. 733-742, 1954.