And in strict conformity with these obvious distinctions, it will be found that, so far as we _are_ able to reduce scientific men of anti-Catholic opinions to the type of the imaginary bookworm to whom I have been alluding, we do actually use them in our schools. We allow our Catholic student to use them, so far as he can surprise them (if I may use the expression), in their formal treatises, and can keep them close prisoners there. Vix defessa senem passus componere membra, Cum clamore ruit magno, manicisque jacentem Occupat. The fisherman, in the Arabian tale, took no harm from the genius, till he let him out from the brass bottle in which he was confined. “He examined the vessel and shook it, to see if what was within made any noise, but he heard nothing.” All was safe till he had succeeded in opening it, and “then came out a very thick smoke, which, ascending to the clouds and extending itself along the sea shore in a thick mist, astonished him very much. After a time the smoke collected, and was converted into a genius of enormous height. At the sight of this monster, whose head appeared to reach the clouds, the fisherman trembled with fear.” Such is the difference between an unbelieving or heretical philosopher in person, and in the mere disquisitions proper to his science. Porson was no edifying companion for young men of eighteen, nor are his letters on the text of the Three Heavenly Witnesses to be recommended; but that does not hinder his being admitted into Catholic schools, while he is confined within the limits of his Preface to the Hecuba. Franklin certainly would have been intolerable in person, if he began to talk freely, and throw out, as I think he did in private, that each solar system had its own god; but such extravagances of so able a man do not interfere with the honour we justly pay his name in the history of experimental science. Nay, the great Newton himself would have been silenced in a Catholic University, when he got upon the Apocalypse; yet is that any reason why we should not study his Principia, or avail ourselves of the wonderful analysis which he, Protestant as he was, originated, and which French infidels have developed? We are glad, for their own sakes, that anti-Catholic writers should, in their posthumous influence, do as much real service to the human race as ever they can, and we have no wish to interfere with it. 3.