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_THE SECOND EDITION, CORRECTED._

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LONDON:
PRINTED FOR. J. JOHNSON, IN ST. PAUL'S CHURCH-YARD.
1796.

Entered at Stationers' Hall.

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DEDICATION.

To the candid and ingenious Members of the College of Physicians, of the
Royal Philosophical Society, of the Two Universities, and to all those, who
study the Operations of the Mind as a Science, or who practice Medicine as
a Profession, the subsequent Work is, with great respect, inscribed by the
Author,

DERBY, May 1, 1794.

CONTENTS.

_Preface._
SECT. I. _Of Motion._
II. _Explanations and Definitions._
III. _The Motions of the Retina demonstrated by Experiments._