ISOMKRIDES OF ALIZARINE. 45 



according to Schvitzenberger's process, we are enabled to 

 assert positively that the two bodies are not identical. 



The water of crystallization of the isoanthraflaviue crystal- 

 lizing in needles was determined by heating the substance 

 after drying over sulphuric acid to 150°. 



I. 0-2150 grm. of substance treated in this way lost 

 0'oi46 grm. H^Oj or 679 p. c. 



II. 0-2064 grm. of substance lost 0-0138 grm. H^O, or 

 6-69 p. c. 



The analysis of the dry substance yielded the following 

 results : — 



I. 0-2700 grm. of substance gave 0-6910 grm. CO^ and 

 0-0880 grm. H^O. 



II. 0*2808 grm. of substance gave 0*7154 grm. 00^ and 

 0*0880 grm. H^O. 



III. 0*2622 grm. of substance gave 0*6720 grm. COi 

 and 0*0876 grm. H^O. 



IV. 0*2484 grm. of substance gave 0-6362 grm. 00^ and 

 0*0840 grm. H^O. 



V. 0*2692 grm. of substance gave 0-6904 grm. COj, and 

 0*0908 grm. HjO. 



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



Ci4 168 7000 6979 6948 69-89 6985 6994 



Hg 8 3-33 3-62 348 371 375 374 



O^ 64 2667 



240 1 OO'OO 



The determinations of the water of crystallization given 

 above lead to the formula 0,^.11 804.Hj,0 for the crystallized 

 acid, which requires 6-97 p. c. for the quantity of water 

 expelled on heating. 



The barium compound of isoanthraflaviue crystallizes in 

 small dark red needles resemblinsr barium anthraflavate. 



