The late Harold Laski, in a letter to O. W. Holmes, characterized Persons’s Jesuit’s Memorial as “the most cold-blooded plot for exterminating opponents known outside St. Bartholomew.” On the face of it, this tends to confirm the suspicion which was expressed by Holmes in this very correspondence, and which reviewers have voiced since the letters were published, that Laski often wrote about books of which he had a very imperfect knowledge. And yet there is a sense in which the Jesuit’s Memorial is cold blooded, iust as the whole Counter-Reformation was in a certain sense cold-blooded. Whenever the Church is faced with a new challenge she must tighten up her lines of discipline and ruthlessly prune certain: venerable practices and customs or at least establish an order of priority among them. Many view with distaste the mentality engendered by the Council of Trent. It would be well, however, to try and see what the Counter-Reformation was trying to do before we condemn it. And for a real insight into the Counter Reformation spirit few books can equal the Jesuit’s Memorial.