Revisor’s Note
This is a revision, not a rewriting. Various deletions and additions have been made with the intent of bringing the work up to date within the scope of the original plan and methods of the authors. In this way it has been possible to preserve the features that have made this manual a standard guide for the past thirty years.
EDWARD P. FARRELL, O.P., S.T.LR., S.T.D. Washington, D.C., June 8, 1958