Theodore Hoe Mead, Horsemanship for Women (1887)
“ If so, restrain him by successive tugs, punishing him a little with the curb, if necessary, and always rewarding him with praises and caresses when he does well. Avoid any violent use of the curb, or the horse, in his efforts to escape the pain, may get his tongue over the bit, and thus acquire a very troublesome habit. It must be remembered that the bit being the principal channel of communication between his mind and yours, his whole attention is concentrated upon it, and he is almost as much disconcerted by a sudden harsh movement of it as you would be by an unexpected shout in your ear. ”
