84 PROCEEDINGS OF THE AMERICAN ACADEMY 



ditions. The red modification is more soluble in methyl than ethyl 

 alcohol ; very freely in acetone. Both these solutions deposit some 

 yellow crystals. Soluble in ether or chloroform ; slightly soluble in 

 cold benzol, freely in hot. The solution in benzol or chloroform de- 

 posits the substance in a viscous state. It is slightly soluble in cold 

 glacial acetic acid, more soluble in hot ; from this solution it is usually 

 precipitated by the addition of water in the yellow form, although 

 once or twice we thought we obtained the red modification ; very 

 slightly soluble in carbonic disulphide ; insoluble in ligroiue. Strong 

 sulphuric acid when cold has no action on it, but dissolves it with a 

 brownish yellow color when hot ; strong nitric acid dissolves it par- 

 tially when cold with a yellow color, and the action is increased by 

 heating ; cold hydrochloric acid has no action on it, but dissolves it 

 very slightly when hot. 



Telloic Modification of Anilidotrinitrophenyltartronic Ester. 



This substance was most conveniently obtained from the mixture of 

 the two forms, after it had been purified by several crystallizations 

 from alcohol, by dissolving it in warm glacial acetic acid, and, after 

 allowing the solution to stand for some hours, precipitating the solid 

 matter by the addition of water. The yellow powder thus obtained 

 was dried at ordinary temperatures over sulphuric acid, and analyzed 

 with the following results : — 



I. 0.1879 gr. of the substance gave on combustion 0.3284 gr. of car- 

 bonic dioxide and 0.0726 gr. of water. 

 II. 0.1924 gr. of the substance gave 20.5 c. c. of nitrogen at a tem- 

 perature of 25° and a pressure of 769.7 mm. 



Calculated for Found. 



CeH(CuH5NU)tN0.)3C0U(C02C2H5)2. I II. 



Carbon 47.69 47.66 



Hydrogen 3.77 4.29 



Nitrogen 11.71 12.05 



The substance dried over sulphuric acid lost no weight when heated to 

 100°, showing that it contams neither water nor alcohol of crystal- 

 lization. 



Properties. — The yellow form crystallizes in very fine needles 

 united into spherical groups like those of wavellite, looking frequently 

 like little balls of fat, and has a full yellow color like that of potassic 

 chromate. It is hard to determine the melting point with accuracy, 

 because this form is quickly changed into the red modification, at least 



