[15] It is absolutely essential that the tests should be pure.
[16] Philosophical Magazine, vol. xv. p. 252.
[17] Transactions of the Royal Society of Edinburgh, vol. viii. p. 259.
[18] Sir G. Baker, Med. Trans. vol. i. p. 280.
[19] Lamb on Spring Water.
[20] Medical Trans. vol. i. p. 420.
[21] Van Swieten ad Boerhaave, Aphorisms, 1060. Comment.
[22] Medical Comment. Dec. 2, 1794.
[23] Lambe on Spring Water.
[24] See An Analysis of the Mineral Waters of Tunbridge Wells, by Dr. Scudamore, p. 55.