156 PROCEEDINGS OF THE AMERICAN ACADEMY. 



by heating it in a sealed tube with nitric acid (specific gravity 1.5) and 

 weighing the argentic chloride formed. 



I. 0.1223 gram of the substance gave 0.0459 gram of argentic chloride. 

 II. 0.1866 gram of the substance gave by the method of Carius (with an 

 excess of argentic nitrate) 0.1425 gram of argentic chloride. 



Properties of the Silve?- Salt. — If in making this salt the argentic 

 nitrate is added slowly to a cold dilute solution of the isoamylamine salt, 

 and the separation takes place slowly, the salt is obtained in olive-gray 

 needles, which contain two molecules of water of crystallization, as 

 shown by the analysis given above. These needles, when heated to 

 110°, lose the water of crystallization, and turn red. If, on the other 

 hand, the solution of argentic nitrate is added to a warm concentrated 

 solution of the isoamylamine salt, a red gelatinous precipitate is obtained, 

 which looks very much like currant jelly, and to judge from its color 

 consists of the anhydrous salt. The red gelatinous mass showed a ten- 

 dency to pass over into the gray crystalline form ; and the red amorphous 

 body could be obtained from the gray needles by dissolving them in a 

 hot mixture of alcohol and water and cooling rapidly. The crystallized 

 salt is very slightly soluble in cold water, more so in hot; slightly soluble 

 in alcohol. The red amorphous form is insoluble in either water or 

 alcohol. 



The colorless filtrate from the olive-gray crystals obtained in the prep- 

 aration of the silver salt was treated with sodic hydrate, when a strong 

 smell of isoamylamine was observed, showing that the atom of silver had 

 replaced the molecule of isoamylamine in the original salt, as was to be 

 expected. 



Barium Salt of Dichlorisoamylamidoxyquinone, 

 [C6Clo(C5HiiNri)00,]oBa. 2 H-A 



This salt was prepared by adding a dilute solution of baric chloride to 

 the isoamylamine salt dissolved in cold alcohol. The purplish precipi- 

 tate was collected on a filter, and washed first with alcohol, and after- 

 ward with water, until the wash water gave no test for a chloride. It was 

 then dried in vacuo over calcic chloride, and analyzed with the following 

 results : — 



