ourses, yet of a very florid
clear Complexion.

* * * * *

Note.

_The _Reader_ of these Papers is desired, that in those of _Numb. 4. pag.
60. lin. 10_. he would be pleased to read _eight_, instead of _hundred_:
this latter word having been put in by a great over-sight, and without this
Correction, injuring that Author, whose Considerations are there related.
This Advertisement should have been given in _Number 5_. but was omitted
for haste._

* * * * *

Imprimatur _Rob. Say, Vice-Cancel._ Oxon.

Oxford, Printed by _Leonard Lichfield_: for _Richard Davis_. 1665.

{119}

* * * * *

_Num._ 7.

PHILOSOPHICAL
_TRANSACTIONS._

* * * * *

Monday, _Decemb._ 4. 1665.

* * * * *

The Contents.

_Monsieur de _Sons_ progress in working _Parabolar_ Glasses. Some
speculations of Monsieur _Auzout_ concerning the changes, likely to be
discovered in the Moon. The instance of the same Person to Mr. _Hook_,
for communicating his Contrivance of making with Glasses of a few feet
Diameter, _Telescopes_ drawing several hundred feet; together with his
Offer of recompensing that secret with another, which teaches, How to
measure with a _Telescope_ the _Distances of Objects_ upon the _Earth_.
The Experiment of _Kircher_, of preparing a Liquor, that shall sink
into, and colour the whole Body of Marble, delivered at length. An
Intimation of a Way found in _Europe_, to make good _China-Dishes_. An
Account of an odd Spring in _Westphalia_, together with an Information
touching _Salt-Springs_; and a way of straining _Salt-water_. Of the
Rise and Attempts of a way to conveigh Liquors immediately into the
Mass of Blood._

* * * * *

_Of Monsieur _de Sons_ Progress in working _Parabolar_ Glasses._

Since what was mentioned in the immediately precedent _Tract_, touching
Monsieur _de Son's_ noble attempt of grinding Glasses of a _Parabolical_
Figure, the _Publisher_ of these _Papers_ hath himself seen two
_Eye-glasses_ of that shape, about one inch & a half deep, and one inch and
a quarter broad, wrought by this Eminent _Artist_ with a rare
Steel-instrument of his own contrivance and workmanship, and by himself
also polished to admiration. And certainly it will be wondred at by tho