PRODUCTS DERIVED FROM INDIGO-BLUE. 79 



0*52^30 grm. gave 0'2625 grm. chloride of platinum and 

 ammoniiun. 



These numbers correspond with the formula Cj^, H^j NOg, 

 which requires 



Experiment. 

 Calculation. I. II. III. 



Cga 31^ 73'4i 73*42 73"83 73"97 



H33 35 8-23 8-5^6 8-15 8-29 



N 14 3-29 3-15 3-69 3-15 



Os ••• H i5"07 I5'i7 i4"33 H'SP 



425 I00"00 tOO'OO lOO'OO lOO'OO 



This body is therefore formed by the union of i at. of 

 indigo-blue, 6 ats. of alcohol, and 3 ats. of acetic acid, 

 18 ats. of water being eliminated, as will be seen by the 

 following equation : — 



Indigo-blue. Alcohol. Acetic acid. 



Cg, H3, N08+ i8H0=C„ H. NO,-f 6(0^ H, 0,)+3(C, H, OJ. 



The second series of analyses made of this body gave the 

 following results : — 



I. 0-4420 grm. gave I'oSio grm. carbonic acid and 

 0-2515 grm. water. 



0*6550 grm. gave 0"3865 grm. chloride of platinum and 

 ammonium. 



II. 0*4610 grm. gave 1*1820 grm. carbonic acid and 

 0*2745 grm. water. 



0*5085 grm. gave 0*3325 grm. chloride of platinum and 

 ammonium. 



These numbers lead to the formula C40 H^^ NOg, which 

 requires 



Experiment. 

 CalcTilation. I. II. 



C40 240 70*38 . 69*86 69-92 



H23 23 6*74 6*62 6-6i 



N 14 4-10 3-70 4-10 



Og 64 18-78 19-82 19-37 



341 lOO'OO lOO'OO lOO'OO 



