366 ANTIENT METAPHYSICS. Book V. 



exertion of Mind. And this hypothefis, I think, is proved hy the 

 common experiment of a man walking or running againft the wind, 

 where the velocity of the Motion is conftantly diminifhing, both by 

 the obftrudion of the Medium, and the languor of the Moving 

 Power, till, at laft, it will ceafe altogether. 



Nor fliould this hypothefis, of the gradual diminution of the Mo- 

 tion, appear furprifmg to the Newtonians, who now admit that Mind 

 is the caufe of gravitation ; for, as that Motion is conftantly increa- 

 fing, there is no reafon why another Motion, produced likewife by 

 Mind, and in a Body likewife unorganized, fhould not as con- 

 ftantly decreafe, though in a proportion very different ; for, as I 

 have faid elfewhere *, the quicker or flower decay of the Motion will 

 depend upon the greater or lefs violence of the impulfe. 



* Vol. I. pages 542. 543. 



CHAP. 



