The courageous interposition of those philosophers who opposed science and experience to the prejudices of superstition and ignorance, and in doing so incurred much misrepresentation, and perhaps no little ill-will, in the cause of truth and humanity, claim for them some distinction in a work on Demonology. The pursuers of exact science to its coy retreats, were sure to be the first to discover that the most remarkable phenomena in Nature are regulated by certain fixed laws, and cannot rationally be referred to supernatural agency, the sufficing cause to which superstition attributes all that is beyond her own narrow power of explanation. Each advance in natural knowledge teaches us that it is the pleasure of the Creator to govern the world by the laws which he has imposed, and which are not in our times interrupted or suspended. The learned Wier, or Wierus, was a man of great research in physical science, and studied under the celebrated Cornelius Agrippa, against whom the charge of sorcery was repeatedly alleged by Paulus Jovius and other authors, while he suffered, on the other hand, from the persecution of the inquisitors of the Church, whose accusation against this celebrated man was, that he denied the existence of spirits, a charge very inconsistent with that of sorcery, which consists in corresponding with them. Wierus, after taking his degree as a doctor of medicine, became physician to the Duke of Cleves, at whose court he practised for thirty years with the highest reputation. This learned man, disregarding the scandal which, by so doing, he was likely to bring upon himself, was one of the first who attacked the vulgar belief, and boldly assailed, both by serious arguments and by ridicule, the vulgar credulity on the subject of wizards and witches. Gabriel Naudé, or Naudæus, as he termed himself, was a perfect scholar and man of letters, busied during his whole life with assembling books together, and enjoying the office of librarian to several persons of high rank, amongst others, to Queen Christina of Sweden. He was, besides, a beneficed clergyman, leading a most unblemished life, and so temperate as never to taste any liquor stronger than water; yet did he not escape the scandal which is usually flung by their prejudiced contemporaries upon those disputants whom it is found more easy to defame than to answer. He wrote an interesting work, entitled "Apologie pour les Grands Homines Accusés de Magie;" and as he exhibited a good deal of vivacity of talent, and an earnestness in pleading his cause, which did not always spare some of the superstitions of Rome herself, he was charged by his contemporaries as guilty of heresy and scepticism, when justice could only accuse him of an incautious eagerness to make good his argument.