

Exper 



iment. 



ation. 



I. 



II. 



76-07 



76-07 



75*97 



7*97 



8-oo 



7-88 



2-86 



2-87 





13-10 



13-06 





IOO'OO 



ioo-oo 





derived from Indigo-blue. 301 



C G2 372 



& B 39 



N 14 



8 .^64 



489 



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

 position in this process, it is necessary to assume that 1 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 1 at. of the substance, since 



Indigo-blue. Alcohol. Acetic acid. 



C 62 H 39 N0 8 +26HO = C I6 H 5 N0 2 +8(C 4 H 6 2 )+3(C 4 H 4 OJ+2C0 2 . 



On the next occasion, though the method of preparation was 

 exactly the same as that above described, the analysis of the 

 substance led to different results, as the following details will 

 show : — 



I. 0*3810 grm. gave 1*0600 grm. carbonic acid and 0*2385 

 grm. water. 



0*!T280 grm. gave 0*5000 grm. chloride of platinum and am- 

 monium. 



II. 0*4015 grm. gave 1*1200 grm. carbonic acid and 0*2500 

 grm. water. 



0*6235 grm. gave 0*4265 grm. chloride of platinum and 

 ammonium. 



These numbers lead to the formula C 80 H 44 N 2 O )0 , which 

 requires 



Experiment. 

 Calculation. I. II. 



Cho 4 8 ° 75*94 75'87 76-07 



H« 44 696 6-95 6-91 



N 2 28 4-43 4-31 4-29 



O 10 80 12*67 12*87 I2 '73 



632 IOO'OO IOO'OO IOO'OO 



Though this formula differs widely from the first, it presup- 

 poses a similar mode of formation for the substance, the only 

 difference consisting in the relative quantities of the elements 

 uniting to produce it, as will be seen from the following equa- 

 tion : — 



Indigo-blue. Alcohol. Acetic acid. 



C,o H 44 N 2 O 10 +28 HO=2(C 16 H 5 NO 2 )+ 9 (C 4 H O 2 )+2(C 4 H 4 4 )+ 4 C0 2 . 



It appears, therefore, that in both cases its formation was 

 due to the union of indigo-blue with alcohol, acetic acid, and 

 carbonic acid, accompanied by the loss of a certain proportion 

 of water. The alcohol and acetic acid are ingredients employed 



