[56] Lester S. King, "The Road to Scientific Therapy: 'Signatures,' 'Sympathy,' and Controlled Experiment," Journal of the American Medical Association, CXCVII (1966), 250-256.

[57] Boyle, "Usefulness," p. 115.

[58] Ibid., p. 127.

[59] Ibid., p. 130.

[60] Ibid., p. 131.

[61] Van Helmont, "Butler," Ortus Medicinae, pp. 358-365, and Oriatrike, pp. 585-596. See also Boyle, "Usefulness," p. 102.

[62] Van Helmont, Ortus, p. 365; Oriatrike, p. 596.

[63] Boyle, "Usefulness," pp. 135-136.

[64] Ibid., p. 138.

[65] Ibid., p. 144.