Berkeley, George
"Three Dialogues Between Hylas And Philonous"
. You lay it down as a self-evident principle that the
quantity of motion in any body is proportional to the velocity
{242} and taken together; and this is made use of to
prove a proposition from whence the existence of is
inferred. Pray is not this arguing in a circle?
. In the premise I only mean that the motion is
proportional to the velocity, jointly with the extension and
solidity.
. But, allowing this to be true, yet it will not
thence follow that gravity is proportional to , in your
philosophic sense of the word; except you take it for granted
that unknown , or whatever else you call it, is
proportional to those sensible qualities; which to suppose is
plainly begging the question. That there is magnitude and
solidity, or resistance, perceived by sense, I readily grant; as
likewise, that gravity may be proportional to those qualities I
will not dispute. But that either these qualities as perceived by
us, or the powers producing them, do exist in a substratum>; this is what I deny, and you indeed affirm, but,
notwithstanding your demonstration, have not yet proved.
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