In 1734 a workhouse was erected in the present City Hall Park. In 1735 the people made their first manifestation of hostility to Great Britain, which was drawn forth by the infamous prosecution by the officers of the crown, of Rip Van Dam, who had been the acting Governor of the town. The winter of 1740-41 was memorable for its severity. The Hudson was frozen over at New York, and the snow lay six feet on a level. In 1741, a severe fire in the lower part of the city destroyed among other things the old Dutch Church and fort, and in the same year the yellow fever raged with great violence. The principal event of the year, however, was the so-called negro plot for the destruction of the town. Though the reality of the plot was never proved, the greatest alarm prevailed; the fire in the fort was declared to be the work of the negroes, many of whom were arrested; and upon the sole evidence of a servant girl a number of the poor wretches were convicted and hanged. Several whites were charged with being the accomplices of the negroes. One of these, John Ury, a Roman Catholic priest, and, as is now believed, an innocent man, was hanged, in August. In the space of six months 154 negroes and twenty whites were arrested, twenty negroes were hanged, thirteen were burned at the stake, and seventy-eight were transported. The rest were released. In 1750 a theatre was opened, and in 1755 St. Paul's Church was erected. In 1754 the "Walton House," in Pearl street (still standing), was built by William Walton, a merchant. It was long known as the finest private residence in the city. In 1755 the Staten Island ferry, served by means of row boats, was established, and in the same year Peck Slip was opened and paved. In 1756 the first lottery ever seen in the city was opened in behalf of King's (now Columbia) College.