To the most Excellent
D. THEODORUS KETJES,
by his many Peregrinations, a
most famous Phisician, and an
happy Practitioner of Medicine
at Amsterdam,
One of my Intimate Friends.

ALSO,
To the most Noble, most Excellent,
and most Experienc'd, and
Accurate Searchers into the
Vulcanian Anatomy,
D. JOHN CASPARUS FAUSIUS,
Counsellor, and Chief Physician
of the most Serene Elector Palatine
of HEIDELBERG.

AND
D. CHRISTIAN MENTZELIUS,
Principal Physician in the Court
of the most Serene Elector of
BRANDENBURG:
My Reverend Patrons, and intire
Friends.