Quantity Put Into Body Already Made

If we would know why the same Body seems greater (without adding to it) one time, than another; they say, when it seems lesse, it is Condensed; when greater, Rarefied. What is that Condensed, and Rarefied? Condensed, is when there is in the very same Matter, lesse Quantity than before; and Rarefied, when more. As if there could be Matter, that had not some determined Quantity; when Quantity is nothing else but the Determination of Matter; that is to say of Body, by which we say one Body is greater, or lesser than another, by thus, or thus much. Or as if a Body were made without any Quantity at all, and that afterwards more, or lesse were put into it, according as it is intended the Body should be more, or lesse Dense.