JACKSON AND BOOS. — COLORED COMPOUNDS. 181 



tation of baric carbonate from the excess of baric hydrate. The crystals 

 were then dried on a porous plate. Trinitranisol dissolved in naethyl 

 alcohol gives the same compound, when treated with aqueous baric hy- 

 drate, and as thus a purer product was obtained, we prepared most of 

 our material in that way. Analysis of the air-dried substance gave the 

 following result : — 



0.8154 gram of substance gave 0.2394 gram of baric sulphate. 



Calculated for [C6H2(N02)sOCH3]2Ba02H2 . 10 HjQ. Found. 



Barium ' i6.37 ' ' 17.26 



As this indicated that the substance contained water of crystallization, 

 its behavior when heated was studied. 



I. 0.7733 gram of the air dried substance lost 0.1622 gram at 110°- 



130°. 

 II. 0.3513 gram of the air dried substance lost 0.0736 gram at 110°- 

 130°. 

 III. 0.8206 gram of the air dried substance lost 0.1738 gram at 110°- 

 130°. 



Calculated for Pound. 



lC6H2(N02)30CH3],Ba02H2 . 10 H2O. I. II. III. 



Water 21.50 20.97 20.95 21.17. 



I, 0.4064 gram of the s-ubstance dried at 110°-130° gave 0.1504 gram 

 of baric sulphate. 



II. 0.4616 gram of the substance gave 0.1694 gram of baric sulphate. 



III. 0.1296 gram of the substance gave on combustion 0.1201 gram of 



carbonic dioxide * and 0.0259 gram of water. 



IV. 0.2654 gram of the substance gavef 31.4 c. c. of nitrogen under a 



pressure of 753.1 mm. and at a temperature of 20°. 5. 



Calculated for Found. 



[C6H,,(N02)30CH3]2BaOoH2. [CoH(N02)30CH3]2Ba. I. II. III. IV. 



Barium 20.85 22.06 21.76 21.58 



Carbon 25.56 27.05 25.26 



Hydrogen 1.83 1.29 2.22 



Nitrogen 12.78 13.53 13.40 



* Chromic oxide was used to decompose the baric carbonate formed. The sub- 

 stance was spread out in a long copper boat, and heated very carefully to avoid 

 explosions. 



t The substance was mixed with sand to decompose any baric nitrite which 

 might have been formed. 



