es, Vine mites._
He concludeth with taking occasion to discourse of two or three very
considerable subjects, viz. _The inflexion of the Rays of Lights in the
Air; the Fixt stars; the Moon._

In representing these particulars to the Readers view, the Author hath not
only given proof of his singular skil in delineating all sorts of Bodies
(he having drawn all the _Schemes_ of these 60 _Microscopical_ objects with
his own hand) and of his extraordinary care of having them so curiously
engraven by the Masters of that Art; but he hath also suggested in the
several reflexions, made upon these Objects, such conjectures, as are
likely to excite and quicken the Philosophical heads to very noble
contemplations. Here are found inquiries concerning the _Propagation of
Light_ through {29} differing mediums; concerning _Gravity_, concerning the
_Roundness_ of Fruits, stones, and divers artificial bodies; concerning
_Springiness_ and _Tenacity_; concerning the _Original_ of _Fountains_;
concerning the _dissolution of Bodies into Liquors_; concerning
_Filtration_, and the ascent of Juices in Vegetables, and the use of their
_Pores_. Here an attempt is made of solving the strange _Phaenomena_ of
_Glass-drops_; experiments are alleged to prove the _Expansion_ of _Glass_
by heat, and the _Contraction_ of _heated-Glass_ upon cooling; _Des Cartes_
his _Hypothesis of Colours_ is examined: the _cause of Colours_, most
likely to the Author, is explained: Reasons are produced, that _Reflection_
is not necessary to produce _colours_, nor a _double refraction_: some
considerable _Hypotheses_ are _offered_, for the explication of Light by
Motion; for the producing of all colours by Refraction; for reducing all
sorts of colours to two only, _Yellow_ and _Blew_; for making the _Air_, a
dissolvent of all _Combustible Bodies_: and for the explicating of all the
regular figures of _Salt_, where he alleges many notable instances of the
_Mathematicks_ of _Nature_, as having even in those things which we account
vile, rude & course, shewed abundance of curiosity and excellent _Geometry_
and _Mechanism_. And here he opens a large field for inquiries, and
proposeth Models for prosecuting them, 1. By making a full collection of
all the differing kinds of _Geometricall_ figur'd bodies; 2. By getting
with them an exact History of their places where they are generated or
found: 3. By making store of Tryals in Dissolutions and Coagulations of
several Crystallizin