On leaving college, Jay entered the office of Benjamin Kissam, in the city of New-York, as a student at law. Between this gentleman and himself a degree of familiarity and mutual respect existed, quite remarkable considering their relative positions and their disparity of years. For two years in the office of Mr. Kissam, he was the fellow student of the celebrated grammarian, Lindley Murray, with whom he formed an enduring friendship, and who, in a posthumous memoir of himself, thus alludes to his companion: "His talents and virtues gave, at that period, pleasing indications of future eminence; he was remarkable for strong reasoning powers, comprehensive views, indefatigable application, and uncommon firmness of mind. With these qualifications added to a just taste in literature, and ample stores of learning and knowledge, he was happily prepared to enter on that career of public virtue by which he was afterward so honorably distinguished, and made instrumental in promoting the good of his country." Murray was a tall, handsome man, the son of Robert Murray, a venerable quaker of New-York, the location of whose farm at the lower part of the city is still pointed out by the antiquarian. Mr. Jay was admitted to the bar in 1768, and in the pursuit of his profession so extended his reputation that he was soon after appointed secretary of the commission named by the king to determine the disputed boundary between the States of New-York and New Jersey. In 1774 he was married to Sarah, the youngest daughter of William Livingston, an eminent supporter of the American cause during the Revolution, and afterwards for many years governor of New Jersey.