Principio cœlum, ac terras, campofque liquentes,
Lucentemque globum lunæ, titaniaque aftra,
Spiritus intùs alit, totamque infufa per artus
Mens agitat molem, et magno fe corpore mifcet.
VIRG. Æn. vi.

Earth, on whofe lap a thousand nations tread,

And Ocean, brooding his prolific bed,

Night's changeful orb, blue pole, and filvery zones,
Where other worlds encircle other funs,

One Mind inhabits, one diffufive Soul

Wields the large limbs, and mingles with the whole.

DUBLIN:

PRINTED FOR B. DUGDALE, DAME-STREET.
1800.

1

DEDICATION.

To the candid and ingenious Members of the

College of Phyficians, of the Royal Philofophical Society, of the Two Univerfities, and to all those, who ftudy the Operations of the Mind as a Science, or who practise Medicine as a Profeffion, the fubsequent Work is,

With great Respect,

Infcribed by

THE AUTHOR.

DERBY, May 1, 1794,

A 2

Preface.

SECT. I. Of Motion.

II. Explanations and Definitions.

5

7

15

32

III. The Motions of the Retina demonftrated

by Experiments.

IV. Laws of Animal Causation.

V. Of the four Faculties or Motions of the

Senforium.

34

VI. Of the four Claffes of Fibrous Motions. 36

VIII. Of Senfitive Motions,

VII. Of Irritative Motions.

38

X. Of Affociate Motions.

IX. Of Voluntary Motions.

43

46

XI. Additional Obfervations on the Senforial

50

54

Powers.

XII. Of Stimulus, Senforial Exertion, and Fi-

brous Contraction.

62

106

113

135

145

XVII. The Catenation of Animal Motions.

221

235

XIX. Of Reverie.

260

XVI. Of Instinct.

XVIII. Of Sleep.