But the most considerable of all his Posthu∣mous
Works, is his inestimable Treasure of
Letters, that were found in his Trunk, of
which Monsieur Clerselier hath publisht a col∣lection
in three volumes.
XX. These Posthumous pieces, which M.
Clerselier, and the other Cartesians have obli∣ged
the publick with, after the Death of their
Author, were not the only ones, that were
found upon the second rifling of his Papers.
There was besides divers works begun in se∣veral
parts of Mathematicks and Physicks, un∣der
Titles that had no manner of relation to
those subjects, as Parnassus, Olympica, Demo∣critica,
Thacomantis Regia, &c.
His Treatise of Algebra••, still found in the
Studies of some Learned men.
An Introduction, containing the grounds
and foundations of his Algebra, which we are
affraid is lost.
Divers fragments upon the Nature and
History of Metals, Plants, and Animals.
An Abridgement of Pure Mathematicks not
finished.
Divers bundles of free unbyas••ed thoughts
upon the Soul, upon Nature, and framing of
the Universe.
An Introduction to his Geometry, whereof we
have had occasion to speak, which was not so
much his work, as that of one of his friends.
Amongst those which Monsieur Chanut's
care made to fall to Monsieur Clerseliers share,
there is none of them more considerable, nor
perhaps more compleat, than the Latin Trea∣tise,