M. H. Bleibtreu on Cumarine. 491 



The combustion of this substance with oxide of copper 

 gave the following results : — 



0-2567 grm. of substance gave 0*5338 carbonic acid and 

 0-0672 water. 



In per-centage, — 



Carbon .... 56-71 

 Hydrogen ... 2-90 



Nitrocumarine, C 18 4 N ^ V0 4 , contains, as before stated, 



Carbon .... 56*54 

 Hydrogen . . . 2- 62 



whilst nitrocumaric acid, HO, C 18 < -^£v >0 5 , correspond- 

 ing to cumaric acid, ought to contain the following widely 

 differing per-centage, — 



Carbon . . . . 51-67 

 Hydrogen . . . 3*35 



The lead compound was dried at 100°, decomposed by ni- 

 tric, and precipitated by dilute sulphm-ic acid. 



0*6557 grm. substance gave 0*5548 sulphate of lead. 



In per-centage, — oxide of lead 62*27, which would give a 

 formula approaching nearly to 



3PbO,C 18 {^5jo 4 , 



of which the calculated per-centage of lead is 63*66. 



The silver compound being decomposed by the temperature 

 of the water-bath was dried in vacuo. 



A determination of the silver made by burning the com- 

 pound, in which however a slight loss was incurred through 

 deflagration, gave in 0*3037 grm. of substance 0*1526 silver. 



In per-centage, — oxide of silver 53*97, which corresponds 

 to a compound for nitrocumarine and 2 equivalents of oxide 

 of silver, 



2AgO,C l8 {^Jo 4 



of which the per-centage of oxide of silver calculated would be 

 54*83. 



From these experiments it is evident that nitrocumarine 

 undergoes no decomposition on boiling in an alcoholic solu- 

 tion of potassa. The same lead and silver compounds are 

 also obtained by adding a lead or silver salt to nitrocumarine 

 simply dissolved in ammonia. Further experiments must 



2 L2 



