It was a happy idea that led the Père P. C. Sommervogel, himself a member of the order of the Jesuits, to examine the dusty volumes of the “Journal de Trévoux,” and to do for it the only thing that could be done to make it useful once more, at least to a certain degree, namely, to prepare a general index of the numerous subjects treated in its volumes, on the model of the great index, published in 1753, of the “Journal des Savants.” His work, published at Paris in 1865, consists of three volumes. The first gives an index of the original dissertations; the second and third, of the works criticised in the “Journal de Trévoux.” It is a work of much smaller pretensions than the index to the “Journal des Savants;” yet, such as it is, it is useful, and will amply suffice for the purposes of those few readers who have from time to time to consult the literary annals of the Jesuits in France. The title of the “Mémoires de Trévoux” was taken from the town of Trévoux, the capital of the principality of Dombes, which Louis XIV. had conferred on the Duc de Maine, with all the privileges of a sovereign. Like Louis XIV., the young prince gloried in the title of a patron of art and science, but, as the pupil of Madame de Maintenon, he devoted himself even more zealously to the defense of religion. A printing-office was founded at Trévoux, and the Jesuits were invited to publish a new journal, “où l’on eût principalement en vûë la défense de la religion.” This was the “Journal de Trévoux,” published for the first time in February, 1701, under the title of “Mémoires pour l’Histoire des Sciences et des Beaux Arts, recueillis par l’ordre de Son Altesse Sérénissime, Monseigneur Prince Souverain de Dombes.” It was entirely and professedly in the hands of the Jesuits, and we find among its earliest contributors such names as Catrou, Tournemine, and Hardouin. The opportunities for collecting literary and other intelligence enjoyed by the members of that order were extraordinary. We doubt whether any paper, even in our days, has so many intelligent correspondents in every part of the world. If any astronomical observation was to be made in China or America, a Jesuit missionary was generally on the spot to make it. If geographical information was wanted, eye-witnesses could write from India or Africa to state what was the exact height of mountains or the real direction of rivers. The architectural monuments of the great nations of antiquity could easily be explored and described, and the literary treasures of India or China or Persia could be ransacked by men ready for any work that required devotion and perseverance, and that promised to throw additional splendor on the order of Loyola. No missionary society has ever understood how to utilize its resources in the interest of science like the Jesuits; and if our own missionaries may on many points take warning from the history of the Jesuits, on that one point at least they might do well to imitate their example.