78 DR. EDWARD SCIIUNCK ON SOME 



yields anthranilic acid and carbonic acid, in accordance 

 with the following equation : — 



Indigo-blue. Anthranilic acid. 



The oxygen in this case must be derived from water, the 

 hydrogen of which, instead of being set at liberty, probably 

 unites with a portion of the indigo-blue, forming reduced 

 indigo, which dissolves in the caustic alkali. Hence the 

 partial reduction and solution of the indigo-blue, which, as 

 mentioned above, is observed at the commencement of the 

 process. The carbonic acid does not, as might natu- 

 rally be supposed, combine with the alkali, but unites in 

 statu nascenti with alcohol, acetic acid, and a portion of the 

 indigo-blue to form the body A. That it should do so in 

 the presence of an excess of alkali is not more surprising 

 than that acetic acid should, under the same circumstances, 

 leave the base with which it is combined in order to form 

 a perfectly neutral body — a fact of which there can be no 

 doubt. 



B. 



Of this body also two series of analyses were made, the 

 material being obtained at the same time as that of the 

 two series of A. The first series yielded the following 

 results : — 



I- 0'33'5 grm. gave 0*8925 grm. carbonic acid and 

 0*2465 grm. water. 



0*5270 grm. gave 0*2645 grm. chloride of platinum and 

 ammonium. 



II. 0*3330 grm. gave 0*9015 grm. carbonic acid and 

 0*2445 grm. water. 



0*5420 grm. gave 0*3190 grm. chloride of platinum and 

 ammonium. 



III. 0*3390 grm. gave 0*9195 grm, carbonic acid and 

 0*2530 grm. water. 



