100 



Mr. E. Scliiinck on the Colouring and 



[Recess^ 



The substance combined with oxide of lead contained, in 1 00 parts, 



C 45-97 



H 5-52 



N 1-08 



47-43 



100-00 



It will be seen that this analysis yielded results not differing very widely 

 from those of the second analysis. The composition of the substance 

 may therefore be explained in the sam.e manner. 



To the liquid filtered from the lead precipitate {g) there was added an 

 excess of ammonia, which produced a pale cream-coloured precipitate. 

 This was filtered off, washed with water, then suspended in water, and 

 decomposed with sulphuretted hydrogen. The filtered liquid was poured 

 into a flask, and there was added to it a quantity of freshly precipitated 

 oxide of mercury, together with some metallic mercury, the whole being 

 frequently shaken. By this means the hydrochloric acid contained in it 

 was completely removed, after which the liquid was filtered and evaporated. 

 The residue was treated with water, which left a little yellowish powder 

 undissolved. Through the filtered liquid sulphuretted hydrogen was passed 

 in order to precipitate the mercury , in solution, and after being again 

 filtered it was evaporated, when it left a pale yellow syrup. This was 

 treated with alcohol, which dissolved almost the whole of it. To the 

 filtered alcoholic solution there was added a solution of acetate of lead, 

 which produced an almost white precipitate. This was filtered off and 

 prepared as usual for analysis. 



VII. 0'8440 grm. of this compound gave 0'6255 grm. carbonic acid 

 and 0*2110 grm. water. 



1*1035 grm. gave 0*0950 grm. chloride of platinum and ammonium. 

 0'4535 grm. gave 0*3155 grm. sulphate of lead. 

 In 100 parts it contained therefore 



C , 20'2I 



H 2'77 



N 0*54 



25-29 



PbO 51*19 



HKHK) 



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



C 41*41 



H 5-69 



N 1*10 



O 51-80 



100*00 



In this, as in several previous cases, the compound contained more than 



