The Rosicrucian Grand Master Andreae died in 1654, and was succeeded by Thomas Vaughan, whose next step was the publication of his work, entitled "Euphrates, or the Waters of the East." In 1656 he is said to have published the complete works of Socinus, two folio volumes in the collection, entitled _Bibliotheca Fratrum Polonorum_.

Three years later appeared his "Fraternity of R.C.," and in 1664 the _Medulla Alchymiae_.

In 1667 he decided to publish the "Open Entrance," the MS.

of which was returned to him by the editor Langius after printing, and was subsequently annotated in the way I have previously mentioned.

During the early days of the same year Vaughan converted Helvetius, the celebrated physician of the Hague, who in his turn became Grand Master of the Rosicrucian Fraternity.