1867.] Extractive Matters of Urme,—V&Yi I. 



93 



\Tater and decomposed with sulpliuretted hydrogen, and the filtered liquid 

 was evaporated by means of a current of air in the apparatus above referred 

 to. During evaporation some white crystals were deposited, consisting 

 probably of a product of decomposition formed by the action of the free 

 hydrochloric acid on the extractive matter. These were filtered off, and 

 the liquor was evaporated as before to a syrup, which was treated with cold 

 alcohol. The alcoholic solution, after being filtered from some W'hite 

 crystals wdiich were left undissolved, was evaporated to a syrup, wdiich, after 

 being mixed with a little alcohol for the sake of dilution, was poured into 

 a flask and agitated with successive doses of ether as long as anything was 

 taken up by the latter. The residue left undissolved by the ether (c/), after 

 the ethereal liquid (e) had been poured off, was treated with cold alcohol, 

 which dissolved the whole with the exception of some white crystals 

 The filtered liquid was mixed with acetic acid and then with acetate-of-lead 

 solution, and the brown precipitate caused by the latter having been filtered 

 ofr, there was added to it a small quantity of ammonia, which produced a 

 cream-coloured precipitate. This precipitate was filtered off, washed v>'ith 

 alcohol, dried in vacuo, and employed for the following analysis : — 



II. 1'3735 grm. gave 0*7420 grm. carbonic acid and 0'2345 grm. water. 



1*5800 grm. gave 0*1395 grm. chloride of platinum and ammonium. 



0*7210 grm. gave 0*6570 grm. sulphate of lead. 



1*8070 grm. gave 0*0755 grm. chloride of silver, equivalent to 0-0733grm. 

 chloride of lead. 



These numbers lead to the following composition : — 



C 14*73 



H 1*89 



N 0*55 



14*99 



PbO 63*78 



PbCl 4*0 6 



1*0000 



^ These crystals consisted probably of the same substance as those deposited diu-iug 

 the evaporation of the watery solution filtered from the sulphide of lead. They con- 

 tained, besides organic matter, a quantity of sulphates of earthy bases. The latter were 

 removed by dissolving the whole in water and adding an excess of caustic barvta. 

 After passing carbonic acid through the filtered liquid, evaporating to dryness, treating 

 the residue with boiling water, filtering, and again evaporating to dryness, a white crys- 

 talline mass was obtained, which was free from all inorganic impurities. A few of the 

 properties of this substance may be mentioned, though they are not sufiicient to identify 

 it. When heated on platinum-foil it melted and then burned, learing much chax'coal, 

 which, however, disappeared entirely on being further heated. On being heated in a 

 tube, it gave a little crystalline sublimate. It dissolved with difficulty in boiling alcohol, 

 and the solution, on cooling, deposited some transparent, prismatic crystals. The 

 watery solution remained unchanged on the addition of acetate of lead, but on adding 

 ammonia there was an abundant white jDrecipitate. On mixing the watery solution with 

 a salt of copper and an excess of caustic soda it turned blue, but remained unchanged on 

 being boiled. 



