The phenomena of the mystic odors and music, exhibited by Roger Bacon, have been often observed in our own time. To say nothing of our personal experience, we are informed by English correspondents of the Theosophical Society that they have heard strains of the most ravishing music, coming from no visible instrument, and inhaled a succession of delightful odors produced, as they believed, by spirit-agency. One correspondent tells us that so powerful was one of these familiar odors—that of sandal-wood—that the house would be impregnated with it for weeks after the seance. The medium in this case was a member of a private family, and the experiments were all made within the domestic circle. Another describes what he calls a “_musical_ rap.” The potencies that are now capable of producing these phenomena must have existed and been equally efficacious in the days of Roger Bacon. As to the apparitions, it suffices to say that they are evoked now in spiritualistic circles, and guarantied by scientists, and their evocation by Roger Bacon is thus made more probable than ever. Baptista Porta, in his treatise on _Natural Magic_, enumerates a whole catalogue of secret formulæ for producing extraordinary effects by employing the occult powers of nature. Although the “magicians” believed as firmly as our spiritualists in a world of invisible spirits, none of them claimed to produce his effects under their control or through their sole help. They knew too well how difficult it is to keep away the elementary creatures when they have once found the door wide open. Even the magic of the ancient Chaldeans was but a profound knowledge of the powers of simples and minerals. It was only when the theurgist desired _divine_ help in spiritual and earthly matters that he sought direct communication through religious rites, with pure spiritual beings. With them, even, those spirits who remain invisible and communicate with mortals through their awakened inner senses, as in clairvoyance, clairaudience and trance, could only be evoked _subjectively_ and as a result of purity of life and prayer. But all physical phenomena were produced simply by applying a knowledge of natural forces, although certainly not by the method of legerdemain, practiced in our days by conjurers.