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adverse direction to absolute motion, unless there be a 

 destruction, or at least weakening of this vis inertice, 

 which is supposed to be the principle that continues ab- 

 solute motion: then the projectile course of the moon 

 round the earth, must soon destroy her absolute motion. 

 For every month the moon fdr near 500,000 miles, strug- 

 gles in a course, which is in effect, diametrically opposite 

 to the vis inertia, currying her iia another direction. 

 And this cannot happen without continually weakening, 

 and at last wholly destroying it. 



For these reasons, unless I can see them fairly re- 

 moved, 1 must conclude, that even supposing these prin- 

 ciples, assumed by the present philosophy, are real, yet 

 it is impossible to explain the celestial motions by them. 



END OF THE THIRD VOLUME. 



Printed by J. D. Dewick, 40, Barbican, 



