Besides his work for the negro race, William Jay had various public and philanthropic interests. Prominent among these were the duties of judge of Westchester County, which he exercised for more than twenty-five years. Jay revised the rules of the court, which had been handed down almost unchanged since 1728; and he introduced a strict observance of forms, which, combined with his prompt and explicit decisions, made the Westchester court one of the most dignified in the country. The sittings were held alternately at White Plains and at Bedford, the half-shire towns of the county. Jay also attended to chamber business in other towns. At that period the Westchester bar embraced many lawyers of marked ability, such as R. R. Voorhis, Aaron Ward, William Nelson, Peter Jay Munro, J. W. Strong, Minot Mitchell, and James Smith; and from New York, Alexander McDonald, William M. Price, and Peter Augustus Jay frequently appeared among them. It has been said of Judge Jay's charges to grand juries that "they commanded attention, from their clear exposition of the law without the slightest concession to the popular currents of the day and with careful regard to constitutional rights, morality, and justice." These charges were frequently requested for publication as timely reminders of legal and moral truths, the relation of which to current events was being overlooked. Judge Jay's conduct on the bench caused his reappointment term after term by governors of opposing political parties; and after his death, when a pro-slavery faction endeavoured to remove his portrait from the court-house at White Plains, members of the bar who disagreed with Jay's abolition opinions were foremost in preventing any act of disrespect to his memory. Jay's philanthropy was religious in its motive and practical in its activity. A life-long worker in the cause of temperance, his efforts produced substantial results, as in the legislation proposed by him which forbade the sale of intoxicating liquors on credit. For many years a member and president of the Peace Society, he was not satisfied with exposing the evils of war. His mind sought and found a remedy for it in the system of international arbitration, of which the practicability was immediately acknowledged, and towards which the civilized world has since turned with constantly growing confidence.