The following work was written several years since, simply as an historical study, and with little expectation of its publication. Recent movements in several portions of the great Christian Church seem to indicate, however, that a record of ascetic celibacy, as developed in the past, may not be without interest to those who are watching the tendencies of the present.

So far as I am aware, no work of the kind exists in English literature, and those which have appeared in the Continental languages are almost exclusively of a controversial character. It has been my aim to avoid polemics, and I have therefore sought merely to state facts as I have found them, without regard to their bearing on either side of the questions involved. As those questions have long been the subject of ardent disputation, it has seemed proper to substantiate every statement with a reference to its authority.