The success of these made me further think of improving it for…

This depends upon three Suppositions

I shall explaine a Systeme of the World

a kind of solid or hardned froth, or a congeries of very small bubbles consolidated in that form, into a pretty stiff as well as tough concrete, and that each Cavern, Bubble, or Cell, is distinctly separate from any of the rest, without …

in 1658 or 1659 I continued and perfected the air-pump for Mr Boyle, having first seen a contrivance for that purpose made for the same honourable person by Mr Gratorix, which was too gross to perform any great matter.

I have in some of my foregoing observations discovered some new Motions even in the Earth it self, which perhaps were not dreamt of before

all Cœlestial Bodies whatsoever, have an attraction or gravitating power towards their own Centers