The intensity of the secondary transition of the benzene chromophore, often measured at the OO band, decreases in the series CH3, CH2CH3, CH(CH3)2, C(CH3)3[εOO= 265, 215, 180, 115, respectively; medium: cyclohexane] when more methyls are added to the α carbon atom. This phenomenon is linked to the weakening of the [sgrave], π coupling (hyperconjugation) which involves the π cloud of the chromophore and several [sgrave] orbitals of the substituent(1).On the contrary, in the series NH+3, NH+2CH3, NH+(CH3)2and N+(CH3)3, which parallels the precedent one, the intensity increases markedly when going from the unmethylated molecule to the trimethylated one [εOO60, εOO= 75, 100, 170; medium: H2O, HCl, 1, 2 N]. The anilinium ion has the lowest intensity in its series. The toluene has the highest one. On the ground of this observationthe [sgrave], π coupliing could appear as being of a very different nature in the two types of molecules. We should like to show in the present paper that, in fact, the surprising results concerning the anilinium ions, are quite consistent with the results of the alkylbenzenes, and that they can be explained on the bases of the same hyperconjugative scheme.