216 PROCEEDINGS OF THE AMERICAN ACADEMY. 



solution of potassic sulphocyanate, but a strong test for a ferrous salt 

 with potassic ferricyanide. As it was possible that it might be a ferric 

 iodide which was decomposed by water into the ferrous salt and free 

 iodine, we next tested for iodine both with starch paste and with carbonic 

 disulphide, but with negative results. These qualitative experiments 

 indicated that the substance, in spite of its red color, was ferrous iodide ; 

 and that this is the case was proved by the following analyses. The 

 substances used in I.-V. and in IX. and X. were the direct product of 

 the reaction. In VI., VII., and VIII. this product had been purified 

 by sublimation before it was analyzed. 



I. 0.6717 gram of substance gave 1.0202 gram of argentic iodide 

 and 0.1720 gram of oxide of iron. 

 II. 1.0400 gram of substance gave 1.5736 gram of argentic iodide. 



III. 0.9658 gram of substance gave 1.4601 gram of argentic iodide. 



IV. 0.7493 gram of substance gave 1.1471 gram of argentic iodide 



and 0.1934 gram of ferric oxide. 

 V. 0.8327 gram of substance gave 1.2586 gram of argentic iodide 

 and 0.2209 gram of ferric oxide. 

 VI. 1.2675 gram of substance gave 1.9232 gram of argentic iodide 

 and 0.3261 gram of ferric oxide. 

 VII. 0.7396 gram of substance gave 1.1192 gram of argentic iodide 



and 0.1932 gram of ferric oxide. 

 VIII. 0.5944 gram of substance gave 0.8978 gram of argentic iodide. 

 IX. 0.3831 gram of substance gave by ignition 0.0982 gram of ferric 



oxide. 

 X. 1.7526 gram of substance gave by ignition 0.4658 gram of ferric 

 oxide. 



