 James Wetmore of North Haven, formed a group to study the Anglican divines and the "doctrines and facts of the primitive church".Their reading and discussions led them to question the validity of their ordinations, and the book group members converted from embracing a Presbyterian polity on ordination to an Episcopal one sometime in 1722.At Yale's September 13, 1722 commencement, in a very public and dramatic event labeled the “Great Apostasy” by American religion historian Sidney Ahlstrom, the nine member group declared for the episcopacy.