184 Oni the Measuré of 
times they generate equal velocities, but not 
necessarily equal forces in the equal bodies; 
should not make the least scraple to own that 
I thought his reasoning solid and conclusive, 
and his distinctions a full answer to every 
objection of that sort.” To this, Dr. Milner 
has added the following note: ‘No doubt 
Mr. Maclaurin refers to the following passage 
of Bernoulli—La force du choc, ou de l’action 
des cor'ps les uns sur les autres; depend unique- 
ment de leurs vitesses respectives; or il est 
visibles que les vitesses respectives des corps 
ne changent pas avant le choc, soit que le plan 
ou Pespace qui les contient soit sans mouve- 
ment, soit quil se mouve uniformement, 
suivant, une direction donnée, les vitesse re- 
spectives seront donc encore les mémes apres 
le choc. This quotation puts the matter be- 
yond dispute. It is plain, Bernoulli, though 
he makes use of the word aetion, is’ only 
speaking of the motion lost or communicated, 
and the relative velocities of the bodies: there 
is not the most distant hint at the change in 
their absolute forces.” 
“In addition to this, I would, with great. 
deference, observe, that by the term equal 
actions of the spring, as used above by Mr. 
Maclaurin, equal pressures only are meant : 
but M. Bernoulli held that the motion of a 
