Besides the works already noticed, he wrote De arte critica (1597); De Antichristo (1605); Pro auctoritate ecclesiae in decidendis fidei controversiis libellus; Scaliger hypololymaeus (1607), a virulent attack on Scaliger; and latterly the anti-jesuitical works, Flagellum Jesuiticum (1632); Mysteria patrum jesuitorum (1633); and Arcana societatis Jesu (1635).
These remedies were arcana - a word corresponding partly to what we now call specific remedies, but implying a mysterious connexion between the remedy and the "essence" of the disease.
Arcana were often shown to be such by their physical properties, not only by such as heat, cold, &c., but by fortuitous resemblances to certain parts of the body; thus arose the famous doctrine of "signatures," or signs indicating the virtues and uses of natural objects, which was afterwards developed into great complexity.
Three hundred and twenty-nine letters to Augustus of Saxony dating from the 17th of November 1565 to the 8th of September 1581, and one hundred and eleven letters to the chancellor Mordeisen dating from November 1559 to the summer of 1565, are preserved in MS. in the Saxon archives, and were published by Ludovicus at Halle in 1699 under the title Arcana seculi decimi sexti.
Hartley translated Heaven and Hell (1778) and True Christian Religion (1781); Clowes, who taught New Church doctrine in the existing churches and was opposed to the forming of new organizations, translated 17 volumes, including the Arcana Coelestia, and published over 50 volumes of exposition and defence.