1867.] 



Extractive Matters of Urine.— Vavt I. 



117 



solved. The liquid was filtered, sulphnretted hydrogen was passed through 

 it, and after being filtered from the precipitated sulphide of lead, a boiling 

 solution of sulphate of silver was added to it as long as any precipitate of 

 sulphide or chloride of silver was produced. The excess of silver was re- 

 moved from the filtered liquid by sulphuretted hydrogen, and the liquid 

 having been again filtered was agitated with carbonate of lead, which took 

 away the sulphuretted hydrogen and the sulphuric acid contained in it. It 

 was then filtered, sulphuretted hydrogen was passed through it, and after 

 being filtered from the sulphide of lead, it was evaporated in the hot-air 

 stove to a syrup. This syrup was then poured into a flask, a little alcohol 

 and a large quantity of ether were added, and the whole was well shaken. 

 After standing for some time the ethereal liquid was poured off from the 

 undissolved portion of the syrup (e) and evaporated. The residue left after 

 evaporation was treated with water, and the resulting solution was filtered 

 from a little fatty matter which was left undissolved and evaporated. The 

 residue was poured into a flask and treated with ether. After standing 

 some time the liquid was poured off from the undissolved syrup-like matter 

 (/) and evaporated, and the residue was treated again with ether, which 

 left a little more syrup-like matter undissolved. The residue now left was 

 dissolved in alcohol, and to the solution acetate of lead and ammonia were 

 added. The precipitate thereby produced was filtered off, washed with 

 alcohol, and treated with a little dilute acetic acid, in which it was for the 

 most part soluble. Some brown flocks which were left undissolved were 

 filtered off, and the liquid was mixed with a large quantity of alcohol which 

 produced a pale cream-coloured precipitate. This was filtered off, washed, 

 dried, and analyzed, the following results being obtained : — 



V. 1-2335 grm. gave 0*8460 grm. carbonic acid and 0-23/5 grm. water. 

 1'5440 grm. gave 0*1175 grm. chloride of platinum and ammonium. 

 0'7570 grm. gave 0*6265 grm. sulphate of lead. 

 These numbers lead to the following composition 



C 18-70 



H 2-13 



N 0'47 



17-81 



PbO 60-89 



100*00 



The composition of the substance combined with oxide of lead agrees 

 tolerably well with the formula C^q H^^ NOgQ, which requires 



Calculation. Experiment. 



516 48*'27 47-81 



H,9 59 5*52 5*44 



N 14 1*30 1-20 



O,, 480 44-91 45;55 



1069 100-00 100-00 



