The shift ofn-π* bands of some azines on chloro substitution is examined assuming that the chloro substituent has only inductive character. This inductive character consists of both σ and π-electron interactions; the σ effect is approximated by the theory of Pople and Santry [7], whilst the π effect is assumed to have both short and long-range characteristics in the perturbing potential [1]. The calculations lead us to the conclusion that the approximations made in the estimation of σ effects are almost certainly responsible for the poor agreement observed between theory and experiment.