138 On the Measure of 
absolutely proscribed the discussion of it.* 
That circumstance, however, enhances the 
value of the indulgence, of which I now avail 
myself, in submitting it to the considera ation of 
this society. 
Proceeding now to the consideration of the 
particular cases which I have described, I 
may observe, that the first two cases (p. 115.) 
comprehend, I believe, the chief points at issue, 
as far as they relate to force producing rectili- 
near motion by the intervention of levers or 
wheels, and to motion produced about fixed 
axes. 
That the forces of C and D in the first case 
are equal, cannot, I think, be questioned ; and 
it is not less obvious that their effects, if esti- 
mated by the masses into the squares of their 
velocities, are also equal. 
In the second case, the force of P is twice 
that of Q, and the effects of these forces, if , 
measured by the masses into the squares of 
their velocities, are respectively in the same 
proportion. 
Mr. Atwood (as we have already noticed at 
page 109) admits, that the measure composed 
of the mass into the square of its velocity 
* The French National Institute has, I understand, pro- 
hibited the reception of all dissertations on the measure 
of force, 
