Note 19 — PART I.
Reading edition
The incautious use of that rein, which has leverage on the curb, is very apt, with young unformed horses, or such as have been only accustomed to the bridoon or snaffle, to induce a notion of rearing, especially in anything of a rough attempt to “rein back” with; indeed, this latter point of training should be accomplished with the bridoon only.