About the year 1772, Preston submitted his course of lectures on the first three Degrees to the Craft of England. These lectures were a revision of those which had been practiced, with various modifications, since the revival of 1717, and were intended to confer a higher literary character on the Masonic Ritual. Preston had devoted much time and labor to the compilation of these lectures, a syllabus of which will be found in his Illustrations They were adopted eagerly by the English Fraternity, and continued to be the authoritative system of the Grand Lodge of England until the Union in 1813, when, for the sake of securing uniformity, the new system of Doctor Hemming was adopted. But the Prestonian lectures and ritual are still used by many Lodges in England. In the United States they were greatly altered by Webb.