124 



Mr. E. Scliunck on the Colouring and 



[Recess^ 



filtered oif, an excess of alcoholic-lead solution gave an abundant precipi- 

 tate, which was filtered off and then treated with acetic acid, less acid 

 being taken than would have sufficed to dissolve it entirely. The filtered 

 liquid was mixed with a large quantity of alcohol, which gave a precipitate 

 of a pure cream-colour. This was analyzed in the usual manner. 



II. ri365 grm. gave 0"9295 grm. carbonic acid and 0*2695 grm. water. 

 1'5655 grm. gave 0*2595 grm. chloride of platinum and ammonium. 

 0'6855 grm. gave 0'4585grm. sulphate of lead. 



In 100 parts it contained therefore 



C 22-30 



n 2-63 



N 1-04 



O 24-82 



PbO 49;^ 



100-00 



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



C 43-90 



H „ 5-15 



N 204 



48-91 



100-00 



The substance c was treated with alcohol. The liquid was poured off 

 from the portion left undissolved and evaporated. The residue was dis- 

 solved in a little alcohol, and the solution was mixed with a large quantity 

 of ether, which precipitated a syrupy masSv After the latter had settled, 

 the liquid was poured off, and the syrup was dissolved in water. Acetate 

 of lead was added to the solution, and the filtered liquid was mixed with a 

 quantity of alcohol. The precipitate thereby produced was filtered off, 

 washed, dried, and analyzed, the results being as follows : — 



III. 1'1475 grm. gave 0-8800 grm. carbonic acid and 0-2610 grm. water. 

 1-5390 grm. gave 0-2995 grm. chloride of platinum and ammonium. 

 0-7300 grm. gave 0-5135 grm. sulphate of lead. 



In 100 parts it contained therefore 



C 20-91 



H 2-52 



N 1-22 



O 23-60 



PbO 51-75 



To¥oo 



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



C 43-33 



H 5-22 



N 2-52 



O . . 48-93 



100-00 



