1867,'] 



Extractive Matters of Urine. — Part I. 



119 



with alcohol, and the portion left undissolved by the alcohol was dissolved 

 in water. To the watery solution acetate of lead was added, and the filtered 

 liquid was mixed with a large quantity of alcohol, which produced a pale 

 cream-coloured precipitate. This was filtered off and prepared in the usual 

 manner for analysis. 



VII. 1*0625 grm. of this precipitate gave 0*7060 grm. carbonic acid and 

 0*2400 grm. water. 



2*0080 grms. gave 0*2505 grm. chloride of platinum and ammonium. 

 0*8545 grm. gave 0'6210 grm. sulphate of lead. 

 In 100 parts it contained therefore 



C 18-12 



H 2*50 



N 0*78 



O 25*13 



PbO 53-47 



100*00 



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



C 38*94 



H 5*40 



N 1-68 



O 53*98 



100*00 



These numbers seem to point to the conclusion that the extractive mat- 

 ter insoluble in alcohol had also absorbed a considerable quantity of water, 

 in consequence of the long-continued contact of the mixed lead compounds 

 with water. As there seemed, however, some reason to suspect the pre- 

 sence of glucose in the compound of this analysis, I thought it hardly worth 

 while to devise any formula to represent its composition. 



G (1862). 



The next series of experiments was made with urine obtained from the 

 surgical wards of the Manchester Infirmary. By employing material de- 

 rived from an entirely different source, I hoped to obtain further confirma- 

 tion of the results previously arrived at. I refrained, however, from using 

 any truly morbid urine for fear of introducing an element of uncertainty 

 into the experiments. The urine supplied to me, through the kindness of 

 the medical officers of the Institution, did not differ perceptibly from that 

 of healthy individuals, the appearance, colour, and reaction being quite 

 normal. 



The urine was first mixed with a solution of acetate of lead, and the pre- 

 cipitate thereby produced was separated and treated in the manner before 

 described, for the purpose of getting rid of the phosphoric and uric acid 

 contained in it ; and by means of acetate of lead and ammonia a precipitate 

 v/as then obtained containing, besides chloride of lead, only compounds of 



