110 



Mr. E. Scliunck on the Colouring and [Recess^ 



C , 43'43 



H , . 5 73 



N 2-82 



O 48-02 



100-00 



Several subsequent analyses led to tlie same composition as this. I shall 

 therefore defer for the present giving the corresponding formula. 



The syrupy matter, insoluble in cold alcohol (h), was treated with cold 

 water, which left a quantity of gelatinous matter undissolved. Through 

 the filtered hquid sulphuretted hydrogen was passed in order to precipitate 

 the lead in solution, and after being again filtered it was evaporated in the 

 air-current to a syrup, which was treated with cold alcohol as long as any- 

 thing was dissolved. A portion (d) was left undissolved. To the filtered 

 liquid there was added an alcoholic solution of acetate of lead, which pro- 

 duced a cream-coloured precipitate. This was filtered off and treated as 

 usual before being analyzed. 



III. ri430 grm. gave 0*5310 grm. carbonic acid and 0"1720 grm. water. 



1*6965 grm. gave O'llOO grm. chloride of platinum and ammonium. 



0*6470 grm. gave 0*6245 grm. sulphate of lead. 



1*0900 grm. gave 0*0485 grm. chloride of silver, equivalent to 0*0471 

 grm. chloride of lead. 



In 100 parts it contained therefore 



C 12-67 



H 1*67 



N 0*40 



13*39 



PbO Q7'^^^ 



PbCl 4*32 



100*00 



The substance combined v/ith oxide and chloride of lead contained, in 

 100 parts, 



C 45*04 



H 5-94 



N 1*44 



O 47-58 



100*00 



The portion of the syrupy residue {d) which was left undissolved by cold 

 alcohol in the preparation of the preceding compound was dissolved in cold 

 water, and to the solution acetate of lead and alcoliol were added, which 

 produced a dirty-white precipitate. This was filtered off, washed with 

 alcohol, suspended in water, and decomposed with sulphuretted hydrogen. 

 The filtered liquid was evaporated in the air-current, and the syrupy residue 

 was treated with alcohol, v/hich left a portion of it undissolved. The latter. 



