(1) Baas, History of Medicine, p. 692.
(2) Based on Thomas H. Huxley's Presidential Address to the British
Association for the Advancement of Science, 1870.
(3) Essays on Digestion, by James Carson. London, 1834, p. 6.
(4) Ibid., p. 7.
(5) John Hunter, On the Digestion of the Stomach after Death, first
edition, pp. 183-188.
(6) Erasmus Darwin, The Botanic Garden, pp. 448-453. London, 1799.