40 DRS. E. SCHUNCK AND H. IIOEMEK ON SOME 



These numbers agree with those which were obtained by 

 Mr. Perkin^ and which led him to infer that anthraflavine 

 and alizarine are isomeric. 



Barium anthraflavate, a salt which has been described in 

 the papers referred to, loses, when dried over sulphuric 

 acid, a considerable quantity of water, becoming at the 

 same time much lighter in colour, and losing much of its 

 lustre. On being now heated at a temperature of 1 50"- 

 180° C, it loses a further quantity of water, and the salt 

 has now a composition corresponding with the formula 

 Cj^HgBaO^, as the following numbers will show: — 



I. 0"2620 grm. of substance gave 0*4284 grm. COa and 

 0-0510 grm. H^O. 



II. o'3540 grm. of substance gave 0-5810 grm. CO^and 

 0-0752 grm. H^O. 



III. 0-3780 grm. of substance gave 0-6150 grm. COj^ 

 and 0-0730 grm. H,0. 



IV. 0-3596 grm. of substance gave 0-2190 grm. BaSO^. 



V. 0-2646 grm. of substance gave 0-1630 grm. BaSO^. 



Theory. I. II. III. IV. V. 



C'u 168 44-80 4459 4476 44-37 



Hs 6 1-60 2-16 2-36 2-14 



Ba 137 36-53 35-78 3622 



O4 64 17-07 



375 lOO-QO 



The quantity of water lost by the salt when dried at 170^, 

 after standing for some time under a bell jar with sulphuric 

 acid, corresponds with two molecules, since 0-7710 grm. of 

 substance lost 00360 grm. water or 4-66 p. c, the formula 

 C,4.H6Ba04..2li^O requiring 4-58 p. c. 



Our results do not quite agree with those of Mr. Perkin^ 

 wbo gives for the salt dried in vacuo, or at 100°, the formula 

 2C,4.H6Ba0^.3Hj,0, and for the same after drying at 150°- 

 180° tiie formula 2C,^H^Ba0^.n,0. 



