JACKSON AND TORREY. — AN ORGANIC OXIDE. 157 



0.2063 gram of the salt dried in vacuo lost 0.0100 gram of water when 

 heated to 110°. 



Calculated for [C6Cl2(C5H„NH)002]2Ba . 2 H,0. Found. 



Water 4.95 4.85 



0.1958 gram of the salt dried at 110° gave 0.0641 gram of baric sulphate. 



Calculated for [C6Cl2(C5HiiNH)002]2Ba. Found. 



Barium 19.83 19.25 



Properties of the Barium Salt. — It consists of crystalline plates of a 

 violet color, which are slightly soluble in cold water, more soluble in 

 hot, but insoluble in alcohol. A dilute solution of the salt gives the 

 black free oxyquinone on addition of hydrochloric acid. 



DicJdorisoamylamidoxyquinone, C6Cl2(C5HiiNH)OH02. 



This substance is formed whenever one of its salts is treated with 

 dilute hydrochloric acid. It was prepared for analysis by adding dilute 

 hydrochloric acid to a solution of the purple isoamylamine salt in warm 

 alcohol ; the black precipitate thus obtained was washed thoroughly with 

 water, and then crystallized from hot benzol, until it showed the con- 

 stant melting point 188°, when it was dried at 100°, and analyzed with 

 the following results : — 



0.1756 gram of the substance gave by the method of Carius 0.1832 gram 

 of argentic chloride. 



Calculated for C6Cl2(C5HiiNH)0H02. Found. 



Chlorine 25.54 25.80 



Properties of Dichlorisoamylamidoxyquinone. — The substance forms 

 bronze black flattened needles, or long plates. When crystallized from 

 hot alcohol and examined with the microscope, rhombic plates are some- 

 times observed, which are more usually united into short and broad 

 plates looking like an hour glass; these crystals have a brownish yellow 

 color, but look black when in thicker layers, as, for instance, when two 

 plates overlap, the portions in contact with each other look black, while 

 the other parts of both plates are brownish yellow, thus giving a very 

 characteristic effect. As the crystallization continues, the hour glass 

 forms develop into the long plates mentioned at first. It melts at 188° ; 

 it is soluble in methyl or ethyl alcohol, benzol, chloroform, ether, or 

 acetone ; slightly soluble in ligroin ; very slightly soluble in carbonic 

 disulphide. Benzol is the best solvent for it. Its solutions show a 

 purple color. Strong sulphuric acid dissolves it with a purple color, 

 but the original substance is precipitated from this solution by dilution 



