426 GIBBS. 



The formation of benzene will result from a rearrangement of the group 



H ■ / VtoH 



The bivalent groups HX T : ( )( and ) X- 



resemble the methylene condition and are capable of various condensa- 

 tions and reactions in a manner similar to that attributed to the latter by 

 X T ef. 



The group HX : / V will probably react in its most stable 



fo 



I'm 



The various products which have been found to result from the action 

 of sunlight either in the presence or absence of oxygen are thus readily 

 accounted for. 



The analogies which the group > XH shows to > have been brought 

 out by E. C. Franklin in his work on liquid ammonia. Baly, Tuck and 

 Marsden, 25 from their investigations of the absortion spectra of certain 

 compounds, note "a striking analogy between the amino- and -OXa 

 groups." 



The absortion spectra of methylaniline and dimethylaniline in alco- 

 holic solutions have been measured by Baly and Collie and by Purvis and 

 in the liquid and vapor states by Purvis. It is noteworthy that, the sub- 

 stitution of the hydrogen of the amino group of aniline by an alkyl elim- 

 inates all of the bands found in the absorption spectrum of the vapor. 

 The general ultra-violet absortion of monomethylaniline begins, at 

 temperature 14° and pressure 755 millimeters, at 250 /xfi and extends to 

 316.5 ixfj. at 100° and 931 millimeters. The absortion of dimethylaniline 

 varies, if at all, only slightly from methylaniline. 



In the liquid state, these compounds show no absorption bands and the 

 general absorption varies with the thickness of the layer, from 331 ml 

 at 0.050 millimeter to 325 li/a at 0.001 millimeter. 



In solutions the heads of the bands of aniline, methylaniline and 



dimethylaniline lie at ~ =3510 (284.9 /*/*), 3450 (289.8 /*/*), and 

 3430 (291.5 pp) respectively. 26 Baly and Collie 27 state: 



25 Journ. Chem. Soc. London (1910), 97, 589. 

 M Baly, Tuck and Marsden. hoc. cit. 589. 

 n hoc. cit. 1342. 



