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                              EXPERIMENTS
                                  ON
                         _THE NERVOUS SYSTEM_,
                 WITH OPIUM AND METALLINE SUBSTANCES;

             MADE CHIEFLY WITH THE VIEW OF DETERMINING THE
                         _NATURE AND EFFECTS_
                                  OF
                          ANIMAL ELECTRICITY.

                       BY ALEXANDER MONRO, M. D.

     PROFESSOR OF MEDICINE, ANATOMY AND SURGERY IN THE UNIVERSITY
       OF EDINBURGH; FELLOW OF THE ROYAL COLLEGE OF PHYSICIANS,
             AND OF THE ROYAL SOCIETY OF EDINBURGH, AND OF
                THE ROYAL ACADEMY OF SURGERY IN PARIS.

                              EDINBURGH:

                  PRINTED BY ADAM NEILL AND COMPANY,
                  FOR BELL & BRADFUTE, AND T. DUNCAN;
                        AND J. JOHNSON, LONDON.

                             M.DCC.XCIII.




                               CONTENTS.

                                                                  _Page_

  INTRODUCTION,                                                        5

  Observations on the Circulating and Nervous Systems of Frogs,        6

  Experiments with Opium,                                              9

  Corollaries from the above Facts and Experiments,                   12

  Summary of Experiments made on Animals with Metalline Substances,   17

  Summary of Facts proved by the foregoing Experiments,               35

  Resemblance of the Fluid put in Motion by the foregoing
  Experiments to the Electrical Fluid,                                38

  The Nervous Fluid or Energy not the same with the