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Philosophical Letters:

OR,

MODEST REFLECTIONS
Upon some Opinions in
_NATURAL PHILOSOPHY_,
MAINTAINED
By several Famous and Learned Authors of this Age,
Expressed by way of LETTERS:

By the Thrice Noble, Illustrious, and Excellent Princess,
The Lady MARCHIONESS of _NEWCASTLE_.

_LONDON_, Printed in the Year, 1664.




TO HER EXCELLENCY
The Lady Marchioness of NEWCASTLE
On her Book of Philosophical Letters.


  _'Tis Supernatural, nay 'tis Divine,
  To write whole Volumes ere I can a line.
  I'mplor'd the Lady Muses, those fine things,
  But they have broken all their Fidle-strings
  And cannot help me; Nay, then I did try
  Their_ Helicon, _but that is grown all dry:_
  _Then on_ Parnassus _I did make a sallie,
  But that's laid level, like a Bowling-alley;
  Invok'd my Muse, found it a Pond, a Dream,
  To your eternal Spring, and running Stream;
  So clear and fresh, with Wit and Phansie store,
  As then despair did bid me write no more._

                              W. Newcastle.




TO HIS EXCELLENCY
The Lord Marquis of NEWCASTLE.


My Noble Lord,

Although you have, always encouraged me in my harmless pastime of
Writing, yet was I afraid that your Lordship would be angry with
me for Writing and Publishing this Book, by reason it is a Book
of Controversies, of which I have heard your Lordship say, That
Controversies and Disputations make Enemies of Friends, and that such
Disputations and Controversies as these, are a pedantical kind of
quarrelling, not becoming Noble Persons. But your Lordship will be
pleased to consider in my behalf, that it is impossible for one Person
to be of every one's Opinion, if their opinions be different, and that
my Opinions in Philosophy, being new, and never thought of, at least
not divulged by any, but my self, are quite different from others: For
the Ground of my Opinions is, that there is not onely a Sensitive, but
also a Rational Life and Knowledge, and so a double Perception in all
Creatures: And thus my opinions being new, are not so easily understood
as those, that take up several pieces of old opinions, of which
they patch up a new Philosophy, (if new may be made of old things,)
like a Suit made up of old Stuff bought at the Brokers: Wherefore to
find out a Truth, at least a Probability in Natural Philosophy by a
new and different way from other Writers, and to make this way more
known, easie and intelligible, I was in a manner forced to write this
Book; for I have not contradicted those Authors in any thing, but
what concerns and is opposite to my opinions; neither do I anything,
but what they have done themselves, as being common amongst them to
contradict each other: which may as well be allowable, as for Lawyers
to plead at the Barr in opposite Causes. For as Lawyers are not Enemies
to each other, but great Friends, all agreeing from the Barr, although
not at the Barr: so it is with Philosophers, who make their Opinions
as their Clients, not for Wealth, but for Fame, and therefore have no
reason to become Enemies to each other, by being Industrious in their
Profession. All which considered, was the cause of Publishing this
Book; wherein although I dissent from their opinions, yet doth not this
take off the least of the respect and esteem I have of their Merits
and Works. But if your Lordship do but pardon me, I care not if I be
condemned by others; for your Favour is more then the World to me, for
which all the actions of my Life shall be devoted and ready to serve
you, as becomes,

My Lord,

_Your Lordships_

_honest Wife, and humble Servant_,

M. N.




TO THE MOST FAMOUS UNIVERSITY OF CAMBRIDGE.


Most Noble, Ingenious, Learned, and Industrious Students.

_Be not offended, that I dedicate to you this weak and infirm work of
mine; for though it be not an offering worthy your acceptance, yet it
is as much as I can present for this time; and I wish from my Soul, I
might be so happy as to have some means or ways to express my Gratitude
for your Magnificent favours to me, having done me more honour then
ever I could expect, or give sufficient thanks for: But your Generosity
is above all Gratitude, and your Favours above all Merit, like as your
Learning is above Contradiction: And I pray God your University may
flourish to the end of the World, for the Service of the Church, the
Truth of Religion, the Salvation of Souls, the instruction of Youth,
the preservation of Health, and prolonging of Life, and for the
increase of profitable Arts and Sciences: so as your several studies
may be, like several Magistrates, united for the good and benefit of
the whole Common-wealth, nay, the whole World. May Heaven prosper you,
the World magnifie you, and Eternity record your same; Which are the
hearty wishes and prayers of,_

Your most obliged Servant

_M. NEWCASTLE._




A PREFACE TO THE READER.


_Worthy Readers_,

I did not write this Book out of delight, love or humour to
contradiction; for I would rather praise, then contradict any Person
or Persons that are ingenious; but by reason Opinion is free, and may
pass without a pass-port, I took the liberty to declare my own opinions
as other Philosophers do, and to that purpose I have here set down
several famous and learned Authors opinions, and my answers to them in
the form of Letters, which was the easiest way for me to write; and by
so doing, I have done that, which I would have done unto me; for I am
as willing to have my opinions contradicted, as I do contradict others:
for I love Reason so well, that whosoever can bring most rational
and probable arguments, shall have my vote, although against my own
opinion. But you may say, If contradictions were frequent, there would
be no agreement amongst Mankind. I answer; it is very true: Wherefore
Contradictions are better in general Books, then in particular
Families, and in Schools better then in Publick States, and better in
Philosophy then in Divinity. All which considered, I shun, as much as I
can, not to discourse or write of either Church or State. But I desire
so much favour, or rather