PHYSICAL anp LITERARY. 103 
that, tho’ they both ftopt at their firft meeting, 
_ this was only done. by fafpending the effec 
of each‘other’s action; and that they would 
refume their former degree of motion, upon 
being feparated by a man’s hand... We find 
however, that the motion of both. bodies is 
irrecoverably loft by fuch a collifion.. If then 
the force of one body is loft or confumed by 
deftroying force in. another: why may not 
one body as. well lofe force by producing it 
in another. Befides, were there any real a- 
tive oppofition in the body at reft, to the 
body in motion; part of the force ought to 
be loft on that account, and the fum of the 
‘motions after the ftroke, would be _lefs 
than the motion before it. 
| WHEN a horfe pulls a ftone forwards, it is 
4 
mopmmonly faid, that the {tone pulls the horfe 
~ back, with a force equal to that with which 
B the horfe pulls the {tone forwards. But no- 
; thing more can poffibly be meant, than that 
the horfe lofes as much force as the ftone 
gains: and that, with refpect to the horfe, 
the effect is the fame, asif there was no 
- ftone tied behind him, but that he was puth- 
ed back with a force equal to that acquired 
= the Hone: The active force of the horfe’s 
a ae limbs 
a 
