as published at Frankfort, and
was entitled _Summum Bonum, quod est Magiae, Cabalae, Alchimiae, Fratrum,
Roseae-Crucis verorum, et adversus Mersenium Calumniatorem_. Besides this,
he wrote several other works upon alchymy, a second answer to Libavius
upon the Rosicrucians, and many medical works. He died in London in 1637.

After his time there was some diminution of the sect in England. They
excited but little attention, and made no effort to bring themselves into
notice. Occasionally some obscure and almost incomprehensible work made
its appearance, to shew the world that the folly was not extinguished.
Eugenius Philalethes, a noted alchymist, who has veiled his real name
under this assumed one, translated _The Fame and Confession of the
Brethren of the Rosie Cross_, which was published in London in 1652. A few
years afterwards, another enthusiast, named John Heydon, wrote two works
on the subject: the one entitled _The Wise Man's Crown, or the Glory of
the Rosie Cross_; and the other, _The Holy Guide, leading the way to unite
Art and Nature with the Rosie Crosse uncovered_. Neither of these
attracted much notice. A third book was somewhat more successful; it was
called _A new Method of Rosicrucian Physic; by John Heydon, the servant of
God and the Secretary of Nature_. A few extracts will shew the ideas of
the English Rosicrucians about this period. Its author was an attorney,
"practising (to use his own words) at Westminster Hall all term times as
long as he lived, and in the vacations devoting himself to alchymical and
Rosicrucian meditation." In his preface, called by him an Apologue for an
Epilogue, he enlightens the public upon the true history and tenets of his
sect. Moses, Elias, and Ezekiel were, he says, the most ancient masters of
the Rosicrucian philosophy. Those few then existing in England and the
rest of Europe, were as the eyes and ears of the great king of the
universe, seeing and hearing all things; seraphically illuminated;
companions of the holy company of unbodied souls and immortal angels;
turning themselves, Proteus-like, into any shape, and having the power of
working miracles. The most pious and abstracted brethren could slack the
plague in cities, silence the violent winds and tempests, calm the rage of
the sea and rivers, walk in the air, frustrate the malicious aspect of
witches, cure all diseases, and turn all metals into gold. He had known in
his time two famous brethren of the Rosie Cross,