102 Mr. E. Scliunck on the Colouring and [Recess^ 



chloride of mercury contained in it was converted into subchloride, and 

 the liquid was rendered free from chlorine. The filtered Hquid, which 

 was almost colourless, was evaporated in the usual manner by means of 

 an air-current, until its volume was considerably diminished. During 

 evaporation a little white matter was deposited which was filtered off. 

 The mercury contained in the solution was removed by means of sul- 

 phuretted hydrogen, and after being filtered it was evaporated as before 

 to a syrup. This syrup was found to be insoluble in cold alcohol. It was 

 therefore dissolved in a little water. To the solution there was added a 

 little acetate of lead, which gave a slight precipitate, and this having been 

 filtered off, the liquid was mixed with alcohol until no more precipitate was 

 produced. This precipitate, which was white, was filtered off, washed with 

 alcohol, and dried in vacuo. On being analj'-zed it yielded the following 

 results : — 



IX. 1-2825 grm. gave 0-6845 grm. carbonic acid and 0-2145 grm. water. 

 1-5205 grm. gave 0*0705 grm. chloride of platinum and ammonium. 

 0*7470 grm. gave 0*6690 grm. sulphate of lead. 

 In 100 parts it contained therefore 



C 14*55 



H 1-85 



N... 0*29 



17-42 



PbO 65-89 



100*00 



The substance combined with oxide of lead contained, in 100 parts, 



C 42*67 



H 5-44 



N - 0-85 



O 51-04 



100-00 



The two last analyses will suffice to show that the chloride of lead depo- 

 sited during the evaporation of the liquid obtained from the precipitate, 

 which basic acetate of lead produces in urine after the addition of neutral 

 acetate, takes down with it a portion of the extractive matter, and that the 

 . composition of this portion is similar to that of the rest which is retained 

 in solution. 



This series of experiments leads to the conclusion that the precipitate 

 produced in urine by basic acetate of lead contains, in combination with 

 oxide and chloride of lead, at least two extractive matters, one of vv^hich is 

 soluble in alcohol and ether, the other soluble in alcohol only, but very 

 sim.ilar to one another in all other respects ; and that it also affords a sub- 

 stance which has the composition and some of the properties of glucose, 

 this being probably a product derived from one or both of the extractive 

 matters, and not preexisting in the urine or even in the lead precipitate 

 itself. 



