(1) (p. 159). A. E. Waite, The Hermetic and Alchemical Writings of Paracelsus, 2 vols., London, 1894. Vol. I., p. 21.
(2) (p. 167). E. T. Withington, Medical History from the Earliest Times, London, 1894, p. 278.
(3) (p. 173). John Dalton, Doctrines of the Circulation, Philadelphia, 1884, p. 179.
(4) (p. 174). William Harvey, De Motu Cordis et Sanguinis, London, 1803, chap. X.
(5) (p. 178). The Works of William Harvey, translated by Robert Willis, London, 1847, p. 56.