1867.] E^etractive Matters of c/TOe.—Part I. 



113 



added to it, producing a cream-coloured precipitate. This was filtered off, 

 washed with water, and treated with dilute sulphuric acid. The excess of 

 the latter having been removed by means of carbonate of lead, the filtered 

 liquid was evaporated in the air-current. The chloride of lead which was 

 deposited during evaporation was filtered off, and the syrupy residue which 

 was left at last was treated with cold alcohol. The liquid was poured off 

 from the undissolved portion and evaporated, and the syrupy residue having 

 been again dissolved in a little alcohol, the solution was mixed with a 

 large quantity of ether, which threw down a portion of the matter in solu- 

 tion. The liquid, which was of a golden-yellow colour, was poured off from 

 the insoluble deposit and evaporated to a syrup. This syrup was poured 

 into a flask and agitated with a quantity of ether. After standing for some 

 time, the ether, which had dissolved a portion of the syrup, was poured off 

 and evaporated. The residue, which was free from compounds of chlorine, 

 was dissolved in alcohol, and to the solution there was added an alcoholic 

 solution of acetate of lead, which produced a precipitate of the usual colour. 

 This was filtered off, washed with alcohol, dried in vacuo, and analyzed, the 

 following results being obtained : — 



I. 1*1080 grm. gave 0*9095 grm. carbonic acid and 0*2500 grm. water. 



1*5035 grm. gave 0*1360 grm. chloride of platinum and ammonium. 



0*7100 grm. gave 0*5430 grm. sulphate of lead. 



These numbers lead to the following composition : — 



C 22*38 



H 2*50 



N 0*54 



l«-78 



PbO 55-80 



100*00 



The composition of the substance combined with oxide of lead corresponds 

 in this case with the formula C^,. H53 NO^j^, which requires 



Calculation. Experiment. 



^ A _^ 



C33 516 50*83 50-65 



H33 53 5*22 5*67 



N 14 1*37 1-22 



Og, 432 42*58 42*46 



1015 100-00 100-00 



On a previous occasion the analysis of the lead compound of the extractive 

 matter soluble in ether led to the formula Cg^ W-^ NO52, which differs from 

 the above by two equivalents of water. This difference might be ascribed 

 to a more or less perfect desiccation of the lead compound ; but I think it 

 is more probably due to an absorption in one case of the elements of water, 

 a process which often takes place with bodies of this class. From the ex- 

 tractive matter insoluble in ether but soluble in alcohol I also prepared a 



