1867.] 



Extractive Matters of Urine. — Part I. 



101 



one substance in combination with oxide of lead. Several other compounds 

 similar to this were subsequently analyzed, and it will therefore conduce to 

 clearness to pass them all under review together. 



The insoluble matter (/), consisting chiefly of chloride of lead, still re- 

 mained to be examined. After being washed with water, it was treated 

 with cold dilute sulphuric acid. The liquid filtered from the sulphate of 

 lead was mixed with an excess of baryta-water, which produced a brown 

 precipitate consisting of sulphate of baryta mixed with some compound of 

 extractive matter. To the filtered liquid there was added a slight excess 

 of acetic acid, and then acetate of lead and sufficient ammonia to neutralize 

 the acid. This gave a pale yellow precipitate which was filtered off, 

 washed, and decomposed with sulphuretted hydrogen. The resulting so- 

 lution was filtered and evaporated. The residue left on evaporation was 

 treated with alcohol, which left a little white matter undissolved. To the 

 filtered liquid there was added an alcoholic solution of acetate of lead, which 

 gave a yellowish precipitate. This was filtered off, washed with alcohol, 

 and treated as usual previous to its being analyzed. 



VIII. 1-2980 grm. of this compound gave 0-9555 grm. carbonic acid 

 and 0-2520 grm. water. 



1*5655 grm. gave 0*2575 grm. chloride of platinum and ammonium. 



0*7115 grm. gave 0-5320 grm. sulphate of fea^^'^N 



1*2690 grm. gave 0*1350 grm". chloride of silver, equivalent to 0*1312 

 grm. chloride of lead. 



In 100 parts it contained theriCoi-a ^-cKdK 



c '^^fm^^^r 



H 2-15 



N 1-03 



O 19-70 



PbO..., 46*71 



PbCl 10*34 



100-00 



The substance combined with the oxide and chloride of lead contained, 

 in 100 parts, 



C 46-74 



H 5-02 



N 2*40 



45-84 



100-00 



To the liquid filtered from the lead precipitate (?), which was employed 

 for the preparation of the last compound, there was added more acetate of 

 lead and an excess of ammonia. The bulky precipitate thereby produced 

 was filtered off, completely washed with water, and then decomposed with 

 sulphuretted hydrogen. The filtered liquid, which had the colour of urine, 

 was mixed with oxide of mercury and left to stand for some time. It was 

 then filtered again and agitated with metallic mercury, by which means the 



