Henry Cornelius Agrippa, who was born in the latter part of the fifteenth century, was, perhaps, the greatest philosopher and scholar of his period.  In early life, he was very much devoted to the science of magic, and was a strenuous supporter of demonology and witchcraft.  In the course of his studies and meditations, he was led to a change of views on these subjects, and did all that he could to warn others from putting confidence in such vain, frivolous, and absurd superstitions as then possessed the world.  The consequence was, that he was denounced and prosecuted as a conjurer, and charged with having written against magic and witchcraft, in order the more securely to shelter himself from the suspicion of practising them.  As an instance of the calumnies that were heaped upon him, I would mention that Paulus Jovius asserted that “Cornelius Agrippa went always accompanied with an evil spirit in the similitude of a black dog;” and that, when the time of his death drew near, “he took off the enchanted collar from the dog’s neck, and sent him away with these terms, ’Get thee hence, thou cursed beast, which hast utterly destroyed me:’  neither was the dog ever seen after.”  Butler, in his “Hudibras,” has not neglected to celebrate this remarkable connection between Satan and the man of learning:—­

    “Agrippa kept a Stygian pug
    I’ th’ garb and habit of a dog,
    That was his tutor; and the cur
    Read to th’ occult philosopher.”

John Wierus wrote an elaborate, learned, and judicious book, in which he treated at large of magic, sorcery, and witchcraft, and did all that scholarship, talent, and philosophy could do to undermine and subvert the whole system of the prevailing popular superstition.  But he fared no better than his predecessor, patron, and master, Agrippa; for, like him, he was accused of having attempted to persuade the world that there was no reality in supernatural charms and diabolical confederacies, in order that he might devote himself to them without suspicion or molestation, and was borne down by the bigotry and fanaticism of his times.

King James merely gave utterance to the general sentiment, and pronounced the verdict of popular opinion, in the following extract from the preface to his “Demonologie:”  “Wierus, a German physician, sets out a public apologie for all these crafts-folkes, whereby, procuring for them impunitie, he plainly bewrays himself to have been of that profession.”

In 1584, a quarto volume was published in London, the work of Reginald Scott, a learned English gentleman, whose title sufficiently indicates its import, “The Discovery of Witchcraft, wherein the lewde dealing of witches and witchmongers is notably detected; the knavery of conjurers, the impiety of inchanters, the folly of soothsayers, the impudent falsehood of cozeners, the infidelity of atheists, the pestilent practices of pythonists, the curiosities of figure-casters, the vanity of dreamers, the beggarly art of alcumstrie, the abomination of idolatrie, the horrible art of poisoning, the virtue and power of natural magic, and all the conveniencies of legerdemaine and juggling, are discovered, &c.”