Shortly after the birth of his daughter, an event he seemed to welcome with a fervour greatly out of keeping with his usual coldness, Curwen resolved to sit for a portrait. This he had painted by a very gifted Scotsman named Cosmo Alexander, then a resident of Newport, and since famous as the early teacher of Gilbert Stuart. The likeness was said to have been executed on a wall-panel of the library of the house in Olney Court, but neither of the two old diaries mentioning it gave any hint of its ultimate disposition. At this period the erratic scholar shewed signs of unusual abstraction, and spent as much time as he possibly could at his farm on the Pawtuxet Road. He seemed, as was stated, in a condition of suppressed excitement or suspense; as if expecting some phenomenal thing or on the brink of some strange discovery. Chemistry or alchemy would appear to have played a great part, for he took from his house to the farm the greater number of his volumes on that subject.
His affectation of civic interest did not diminish, and he lost no opportunities for helping such leaders as Stephen Hopkins, Joseph Brown, and Benjamin West in their efforts to raise the cultural tone of the town, which was then much below the level of Newport in its patronage of the liberal arts. He had helped Daniel Jenckes found his bookshop in 1763, and was thereafter his best customer; extending aid likewise to the struggling Gazette that appeared each Wednesday at the Sign of Shakespeare’s Head. In politics he ardently supported Governor Hopkins against the Ward party whose prime strength was in Newport, and his really eloquent speech at Hacher’s Hall in 1765 against the setting off of North Providence as a separate town with a pro-Ward vote in the General Assembly did more than any other thing to wear down the prejudice against him. But Ezra Weeden, who watched him closely, sneered cynically at all this outward activity; and freely swore it was no more than a mask for some nameless traffick with the blackest gulfs of Tartarus. The revengeful youth began a systematic study of the man and his doings whenever he was in port; spending hours at night by the wharves with a dory in readiness when he saw lights in the Curwen warehouses, and following the small boat which would sometimes steal quietly off and down the bay. He also kept as close a watch as possible on the Pawtuxet farm, and was once severely bitten by the dogs the old Indian couple loosed upon him.