Alexander Wood Renton, 1911 Encyclopædia Britannica, Volume 7… (1911)
“ Corporal punishment in defence of self or others needs no comment, except that, like all other acts done in defence, its justification depends on whether or not it was reasonably necessary for the protection of the person attacked. Among persons invested with punitive authority, mention must first be made of parents and guardians, and of teachers, who have, by implied delegation from the parents, and as incidental to the relation of master and pupil, powers of reasonable corporal punishment. ”
