76 DR. EDWARD SCHUNCK ON SOME 



products which will lead to a few remarks regarding their 

 mode of formation and probable constitution. 



Of this body I made two series of analyses, the speci- 

 mens being prepared on different occasions. Unfortunately 

 the results to which they led did not harmonize, though no 

 difference could be detected in the external properties of 

 the two specimens. 



I. 0*3275 grm. dried at 100° C, and burnt with oxide of 

 copper and oxygen, gave 0*9135 grm. carbonic acid and 

 0*2360 grm. water. 



0*5390 grm., burnt with soda-lime, gave 0*2470 grm. 

 chloride of platinum and ammonium. 



II. 0*3290 grm. of the same gave 0*9165 grm. carbonic 

 acid and 0*2335 grm. water. 



These numbers lead to the formula C^z H35, NOs, which 



requires 



Experiment. 

 Calculation. I. II. 



Cea 37* 76-07 76*07 75*97 



H39 39 7*97 8-00 7-88 



N 14 2-86 z-87 



Og 64 I3-IO i3-o6 



489 lOO'OO lOO'OO 



In. order to explain the formation of a body of this com- 

 position in this process, it is necessary to assume that i 

 atom of indigo-blue has combined with 8 atoms of alcohol, 

 3 ats. of acetic acid, and 2 ats. of carbonic acid, the 

 whole losing 26 ats. of water, and forming i at. of the 

 substance, since 



Indigo-blue. Alcohol. Acetic acid. 



Ce,H3,NOe+26HO=Ci,H,NO,+8(C,HeO,)+3(C,H,OJ-f2CO,. 



On the next occasion, though the method of preparation 

 was exactly the same as that above described, the analysis 



