98 IOWA ACADEMY OF SCIENCES. 



under the same pressure. The yield was one gram of the- 

 ether for every gram of the cresol used. On crystallizing 

 several times from alcohol it was completely purified and 

 analysis yielded the following results: 



Carbon. Hydrogen. Nitngen. 



Calculated for CisHiiN 03 ..68.04 4.83 6.11 per cei t, 



I ....68.13 4.75 6.28 per cent. 



II ....68.20 4.77 6.32 per cent. 



The compound melts at 49° C. It distills with partial 

 decomposition at ordinary atmospheric pressure. It is not 

 volatile with steam. It is very soluble in hot alcohol, 

 from which it crystallizes out in beautiful sulphur yellowy 

 and apparently monoclinic crystals of sufficient size to be 

 easily measured with the goniometer. It has no taste, but 

 feels like sulphur when taken into the mouth. It is very 

 soluble in ether, acetic acid, chloroform, benzene, toluene, 

 aniline, nitro benzene, ethyl acetate, acetone, benzoyl chlo- 

 ride, brom benzene and carbon disulphide. It is sparingly 

 soluble in petroleum ether, and insoluble in water and 

 hydrochloric acid. It is dissolved by concentrated sul- 

 phuric acid with slight charring and by concentrated nitric 

 acid with apparent oxidation, brown fumes being given off. 



2-Nitro phenyl ether-4'-carbonic acid N02.C6H40C,H4.- 



COOH — This acid was prepared by dissolving the above 

 mentioned ether in glacial acetic acid (which had been 

 prepared by distilling Kahlbaum's glacial acetic acid from 

 chromic acid) warming on the steaming water bath and 

 adding very slowly a cold solution of chromium trioxide 

 in glacial acetic acid until a test portion failed to become 

 turbid upon diluting with a large amount of a weak solu- 

 tion of sodium hydroxide. To accomplish this, three or 

 four times the theoretical quantity of chromium trioxide 

 was necessary. To a portion of the ether many times the 

 theoretical quantity of chromium trioxide sufficient for oxi- 

 dation was added and no trace of the acid could be found 

 in the solution. The acid itself had thus probably become 

 completely oxidized. When the oxidation of the ether was 

 judged to be complete, the acid was precipitated from the 

 acetic acid solution by diluting with a large amount of 



