1867.] 



Eootractive Matters of Urine, — Part I. 



107 



of lead is nearly the same as that to which Analysis I. Series A. led, and 

 which was expressed by the formula Cgg Hgg N O^g. It may also be remarked 

 as a singular circumstance, that the quantity of oxide of lead found in the 

 present analysis is equal to the sum of the oxide of lead and chloride o f 

 lead (52'26 + 8'40) of the former. Hence it may be inferred that in^these 

 compounds the chloride of lead and oxide of lead replace one another 

 weight for weight, and not according to their respective equivalents. The 

 same circumstance occurred on several other occasions*, otherwise it 

 might have been attributed to mere accident. 



The glutinous substance («), insoluble in^the mixture of alcohol and ether, 

 was treated with vv^ater. The liquid, after being filtered from some undis- 

 solved matter, consisting chiefly of chloride of lead, was mixed with a solu- 

 tion of acetate of lead and a large quantity of alcohol, which produced a 

 cream-coloured precipitate. This was filtered off, and after being treated 

 in the usual manner, submitted to analysis, the results being as follows : — 



II. r5515 grm. gave 0*9650 grm. carbonic acid and 0-3295 grm. water. 



2*0575 grms. gave 0*3430 grm. chloride of platinum and ammonium. 



9105 grm. gave 0*68/5 grm. sulphate of lead. 



1*1730 grm. gave 0*2340 grm, chloride of silver, equivalent to 0*22/4 

 grm. chloride of lead. 



These numbers lead to the following composition : — 



C 16*96 



H 2*35 



N *. .:. 1-04 



O 20-24 



PbO 40*02 



PbCl 19*39 



100*00 



^The cotoposition of the organic portion of the compound may in this 

 case be represented by the formula C33 NOg^, which requires 



Calculation. Experiment. 



Cgg 228 41*99 41-79 



H^g 29 5*34 5-81 



n\ 14 2*57 2*57 



O3, 272^ 50-10 49*83 



.543 100*00 lOO-OO 



The mixture of extractive matter and chloride of lead obtained in this 

 case was treated in the manner before described, and a compound was 

 obtained which was also analyzed; but the details need not be given as 



* For example, the percentage of oxide of lead of the sixth analysis of Series A 

 (r>7"83) is equal to the sum of the oxide of lead and chloride of lead of the second ana- *" 

 lysis of the same series (G7'84), the amount of other constituents yielded by tlie two 

 analyses being nearly the same. 



I 2 



