2. Like an innkeeper, a common carrier, and other persons who assume a public employment, a farrier is bound to serve the public as far as his employment goes, and an action lies against him for refusing, when a horse is brought to him at a reasonable time for such purpose, if he refuse; Oliph . on Horses, 131 and he is liable for the unskilfulness of himself or servant in performing such work 1 Bl. Com. 431; but not for the malicious act of the servant in purposely driving a nail into the foot of the horse, with the intention of laming him. 2 Salk. 440.