COLORATION OF ANILINE: II. 435 



A 7 II. Methylamine was identified as one of the reaction products of 

 niethylaniline. 



VIII. Dimethylaniline showed only slight coloration after sixty days' 

 exposure to the sun, and it is quite probable that this was due to im- 

 purities since no special methods were employed to purify this com- 

 pound. 



IX. The former work, showing that the fixation of the labile hydrogen 

 atom or atoms reduces or entirely destroys the sensibility of compounds 

 to chemical changes produced by light catalysis, is substantiated by the 

 behavior of aniline, monomethylaniline and dimethylaniline. 



X. The behavior of these compounds furnishes additional proof that 

 the tropical sunlight of this locality is more intense, or more active, than 

 the sunlight of the temperate regions or higher latitudes. 



