[1235]. The statement here given of these phenomena is somewhat different from what is contained in the last edition of this work. The present account is derived from ulterior experiments, partly published in my paper in the Edinburgh Transactions. The discrepancies formerly prevailing between my own researches and those of Captain Yorke are now completely reconciled.
[1236]. Journal de Chim. Méd. ix 714.
[1237]. Annales d’Hyg. Publ. et de Méd. Lég. iv. 55. 1830.
[1238]. Journal de Chim. Médicale, ix. 716. This adulteration has likewise since then attracted attention in London. See British Annals of Medicine, 1837, i. 15.
[1239]. Annales de Chimie, lxxi. 197.
[1240]. In distilled water containing a 12,000th of anhydrous arseniate of soda three lead rods weighing 71·235 grains became in thirty-three days 71·240; in a solution of a 15,000th the lead, though slightly whitened, retained its weight exactly, weighing at the end, as at the beginning, of the experiment 62·622 grains. In distilled water containing a 35,000th of anhydrous phosphate of soda, three lead rods, which weighed together 73·949 grains, became in thirty-two days 73·946; and in a comparative experiment with a solution containing a 27,000th they gained 0·015.
[1241]. Sometimes, however, a minute trace of white powder is attached to the bottom of the glass wherever the lead touches it. This is carbonate of lead at first, and afterwards a mixture like that described in the text.
[1242]. Mr. Morson in Pharmaceutic Journal, ii. 355.
[1243]. On Spring Waters, p. 23.
[1244]. Tronchin de Col. Pict. 66.—1757.