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                                   AN

                                 ESSAY

                              TO SHEW THE

                                 CAUSE

                                   OF

                              ELECTRICITY;

                                  AND

                 Why Some Things are Non-Electricable.

                      In which is also Consider’d

           Its Influence in the _Blasts_ on Human Bodies,
             in the _Blights_ on Trees, in the _Damps_ in
             Mines; and as it may affect the _Sensitive
             Plant_, &c.

                              In a LETTER
                    To Mr. WILLIAM WATSON, _F.R.S._

             By JOHN FREKE, Surgeon to _St. Bartholomew’s_
                       Hospital, _London_, F.R.S.

            _Naturam expellas furcâ, tamen usque recurret._

                 The SECOND EDITION: With an APPENDIX.

                               _LONDON:_
              Printed for W. INNYS, in _Pater-noster Row_.

                               MDCCXLVI.
                         [Price One Shilling.]




------------------------------------------------------------------------




                                   TO

                         _MARTIN FOLKES_, Esq;

                               PRESIDENT

                                 OF THE

                             ROYAL SOCIETY.


    _SIR_,

Those who have the Honour of your Acquaintance, and thence know your
many excellent Qualifications, must applaud my Choice in dedicating this
small Piece to you; whose Name, if there be any Merit in the
Performance, will, before any other, add a Lustre to it. I am, with the
highest Esteem,

                                                     _Your most Obl