FORMATION Of INDIGO-BIT 205 



not much differ from it in appearance but is ftolable in alkalies. 

 Indifulvine is not precipitated from its alcoholic solution by 

 acetate of lead even on the addition of ammonia, as indeed 

 might be inferred from its method of preparation. 



Notwithstanding that I worked with tolerable large quan- 

 of the mixed products of decomposition of indican I 

 obtained only on two occasions, a sufficient quantity of pure 

 indifulvine for analysis. The composition on these two occa- 

 sions was not the same, so that, if the substance was in each 

 case pure, there are, strictly speaking, two bodies having the 

 general properties of indifulvine. Nevertheless the formula? 

 of the two bodies stand in a definite relation to one another 

 and to that of indican, so that in either case the formation of 

 the substance may easily be explained. 



I. 0.3695 grm. dried at 100°C. gave 0.9945 grm. carbonic 

 acid and 0.1795 water. 



0.3605 grm. gave 0.4665 grm. chloride of platinum and 



ionium. 

 These numbers lead to the following composition : — 



Eqs. Calculated. Found. 



Carbon 22 132 73.33 73.40 



Hydrogen 10 10 5.55 5.39 



Nitrogen 1 14 7.77 8.12 



Oxygen 3 24 13.35 13.09 



180 100.00 100.00 

 The second analysis afforded the following data : 



II. 0.3125 grm. gave 0.8975 grm. carbonic acid and 0.1635 

 fcer. 



0.3400 grm. gave 0.4635 grm. chloride of platinum and 

 ammonium. 



Hence may be deduced the following composition : — 



Eqi. Calculated. Found. 



Carbon 264 78.80 78.32 



Hydrogen 19 5.67 5.81 



Nitrogen 2 8.35 8.56 



M8 7.81 



100.00 >.00 



