New York Supreme Court May 6, 1850 (Suydam v. Moore)

Willard, J.

If the Saratoga and Schenectady Railroad Company would have been liable to the plaintiff for the killing of his cow on the occasion in question, had the action been brought against them, the defendants are also liable. The master is liable for the acts of the servant while acting within the scope of his authority, upon the principle that what a man does by another he does by himself.