[27] Ibid., II, 265.

[28] Ibid., III, 442.

[29] Ibid., III, 442-452.

[30] Ibid., I, 50.

[31] Ibid., I, 14.

[32] Walter Needham, Disquisitio anatomica de formato foetu, London, 1667.

[33] John Mayow, "De Respiratione foetus in utero et ovo," in Tractatus Quinque Medico-Physici, Oxonii, 1674, p. 311.

[34] Ibid., pp. 319-320.

[35] Robert Boyle, The Works, London, 1772, I, 548-549.

[36] Browne, op. cit., II, 261.