"This little work consists of a translation of the principal passages of the great treatise of Irenaeus against the heresies. It is not suggested that what has not been translated here is of little value. But it is hoped that this will serve the student and average reader as an introduction to the deeper study of this great Church classic. Notes have been given wherever they were thought necessary, and the chain of the argument is shown throughout in order to facilitate the understanding of the work as a whole."-From the preface.