1867.] 



Extractive Matters of Urine. — Part I. 



121 



These numbers lead to the following composition : — 



C 1970 



H 2-43 



N 1-06 



O 22 00 



PbO 54-81 



100-00 



The composition of the substance combined with oxide of lead agrees 

 very well with the formula C.^^ H,. NOg,, which requires 



Calculation. Ex]3eriment. 



C33 228 43-42^ 43-59 



H^T 27 5-12 5-37 



N 14 2-66 2-34 



O3, 256 48-80 



525 100-00 100-00 

 Several of the preceding analyses gave a composition corresponding more 

 or less closely with the same formula, as I shall show when I come to give 

 a summary of the whole of the results obtained. 



The substance c, w^hich was insoluble in alcohol, was treated with cold 

 water. The resulting solution was filtered from some gelatinous matter 

 (consisting of silica), which was left undissolved, and then agitated with 

 oxide of mercury. After filtration, sulphuretted hydrogen was passed 

 through it in order to precipitate the mercury in solution, and after being 

 filtered it was evaporated. The glutinous residue left on evaporation was 

 dissolved in a very small quantity of water, and the solution was mixed 

 with a large quantity of alcohol, which precipitated a substance of a gluti- 

 nous nature. After standing for some time the liquid was poured off, and 

 the precipitated matter was washed with alcohol and then dissolved in a 

 little water. To the solution there w^as added acetate of lead, which pro- 

 duced a dirty -yellow precipitate ; and the addition of a considerable quan- 

 tity of alcohol to the filtered liquid gave rise to a second precipitate, which 

 was filtered off, washed, dried, and analyzed as usual. 



III. 1-1780 grm. of this precipitate gave 0-8090 grm. carbonic acid 

 and 0'2G60 grm. water. 



2'0705 grms. gave 0-3585 grm. chloride of platinum and ammonium. 

 0-7485 grm. gave 0-5595 grm. sulphate of lead. 

 In 100 parts it contained therefore 



C 18-72 



H 2-50 



N 1-08 



22-70 



PbO 55;00 



100~00 



VOL. XVI. K 



