an Impurity of Metallic Zine. 381_ 
by Otto.* Our apparatus consisted of a flask provided with a funnel- 
tube, and a tube bent at right angles, with which were connected by con- 
nectors of sheet India-rubber, first, a tube of the form of a chlorid of 
one of Bunsen’s triple gas-burners. To prevent any elevation of the tem- 
perature in the flask during an experiment, it was immersed in cold water, 
which the gas was passed through the reduction-tube, a brownish, vola- 
aoe Manual of the Detection of Poisons, Translated from the German by Elder- 
New York: Bailligre. 1857. i a 
t On the aan et aia in foreign sulphuric acid, the following authorities may 
be referred to:—Martius, Schweigger’s Jour. f. Oh. u, Phys., 1811, iii, 363. Wack- 
er, Ann. der Pharm., 1834, xii, 189. Ib., 1835, xiii, 241. Vogel, Jour. f. pr. 
Ch., 1885, iv, 239, Ficinus, Ann. der Pharm., 1835, xv, 47. Berzelius, in his Jabres- 
bericht, 1841, xx, 192, Brett, Philosophical Mag, 1842, [3], xx, 404. Schneder- 
mann and Wohler, Jour. £. pr. Ch. 1845, xxxv, 186. Dupasquier, Comptes Rendus, 
tt = 794, Cameron, Chem. Gazette, No, 320, p. 75, in Jour. f. pr. Ch., 1856, 
li, 64, 
