The art of horsemanship : Hereby is laid down certain, true, and easy rules; on sure and simple principles, to find out the true seat on a horse, how to ride with safety, ease, and grace; the manner of demeanour, when a horse stumbles, and how to preserve the rider from falling when a horse leaps. Rules whereby gentlemen may make horses tractable and is something more than what they learn from the breaker. Addressed to the Society for the Encouragement of Arts, &c. By Laurence O'reilly, Esqr.