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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,