Hypotheses non fingo.

To every action there is always opposed an equal reaction; or, the mutual actions of two bodies upon each other are always equal, and directed to contrary part…

What is there in places empty of matter? and Whence is it that the sun and planets gravitate toward one another without dense matter between them? Whence is it…

The alternation of motion is ever proportional to the motive force impressed; and is made in the direction of the right line in which that force is impressed.

C'est meme des hypotheses simples qu'il faut le plus se defier, parce que ce sont celles qui ont le plus de chances de passer inapercues.

I have not been able to discover the cause of those properties of gravity from phenomena, and I frame no hypotheses;' for whatever is not deduced from the phen…

Natural historians tend to avoid tendentious preaching in this philosophical mode (although I often fall victim to such temptations in these essays). Our favor…