Amulets are certain substances to which the peculiar virtue of curing, removing, or preventing diseases, was attached by the superstitious and credulous; for which purpose they were usually worn about the neck or other parts of the body. The council of Laodicea prohibited ecclesiastics from wearing amulets and phylacteries, under pain of degradation. St. Chrysostome and Jerome were likewise zealous against the same practice. “Hoc apud nos,” says the latter, “superstitiosæ mulierculæ in parvulis evangeliis, et in crucis ligno, et istiusmodi rebus, quæ habent quidam zelum Dei, sed non juxta scientiam usque hodie factitant.”—_Vide Kirch. Oedip. Egypt._ At the present day, although by no means entirely extinct, amulets have fallen into disrepute; the learned Boyle nevertheless considered them as an instance of the ingress of external effluvia into the habit, in order to shew the great porosity of the human body. He moreover adds, that he is persuaded “some of these external medicaments do answer;” for that he was himself subject to a bleeding from the nose; and being obliged to use several remedies to check this discharge, he found the moss of a dead man’s skull, though only applied so as to touch the skin until the moss became warm from being in contact with it, to be the most efficacious remedy. A remarkable instance of this nature was communicated to Zwelfer, by the chief physician to the states of Moravia, who, having prepared some troches, or lozenges of toads, after the manner of Van Helmont, not only found that being worn, as amulets, they preserved him, his domestics, and friends, from the plague, but when applied to the carbuncles or buboes, a consequence of this disease, in others, they found themselves greatly relieved, and many even saved by them. Mr. Boyle also shews how the effluvia, even of cold amulets, may, in the course of time, pervade the pores of the living animal, by supposing an agreement between the pores of the skin and the figure of the corpuscules. Bellini has demonstrated the possibility of this occurrence, in his last proposition _de febribus_; the same has also been shewn by Dr. Wainwright, Dr. Keil, and others. There were also verbal or lettered charms, which were frequently sung or chaunted, and to which a greater degree of efficacy was ascribed; and a belief in the curative powers of music has even extended to later times. In the last century, Orazio Benevoli composed a mass for the cessation of the plague at Rome. It was performed in St. Peter’s church, of which he was _maestro di capella_, and the singers, amounting to more than two hundred, were arranged in different circles of the dome; the sixth choir occupying the summit of the cupola.