[44] M: pp. 33, 34.
[45] M: pp. 34, 35. Aristotle, Works, ed. W. D. Ross, Oxford, 1908—1952, vol. 2, De generatione et corruptione, translated by H. H. Joachim, 1930, vol. 3, Meteorologica, translated by E. W. Webster, 1931.
[46] M: pp. 34, 35, 64, 65, 69, 81. Dr. H. Guerlac has kindly brought to my attention the similarity between the explanation given in Gilbert and that given in the Meteorologica, bk. 3, ch. 6. p. 378.
[47] M: p. 83.
[48] A statement of the relation between Aristotle's four elements and place can be found in Maier, op. cit. ([footnote 17]), pp. 143-182.
[49] M: pp. 21, 34, 35, 36, 45.
[50] M: pp. 35, 36, 38, 69; see, however, pp. 42-43: "Iron ore, therefore, as also manufactured iron, is a metal slightly different from the homogenic telluric body because of the metallic humor it has imbibed ..."
[51] M: pp. 19, 34, 36, 37, 42, 69.
[52] M: pp. 35, 36, 37, 38.
[53] M: pp. 38, 63, 69, 84; on p. 34 he says that iron is "more truly the child of the earth than any other metal"; it is the hardest because of "the strong concretion of the more earthy substance."