A serious call to the Quakers inviting them to return to Christianity : By George Keith. To which is added, a true copy of the last will and Testament of that grand impostor George Fox, the first beginner of Quakerism, and the Quakers admired idol; who died Jan. 13, 1690. 1. Written with his own hand, and attested by George Whitehead, Sarah Mead, and Will. Ingram, and is now lying in the Perogative-Office London.