74 LECTURE VII. 



must ascend Avith an equal quantity of motion, it appears absurd to suppose 

 that the force of gravitation could produce these two equal and contrary effects 

 at the same time. But it is more satisfactory to trace, in every case, the steps 

 by which the immediate actions of the different weights are enabled to oppose 

 each other; and the general law may then be inferred, by induction, from the 

 agreement of the particular results, in confirmation of the general reasoning 

 which tends tp establish its trutk 



