Dans la nature rien ne se crée, rien ne se perd, tout change.

In nature nothing is created, nothing is lost, everything changes.

Vegetation is the basic instrument the creator uses to set all of nature in motion.

I consider nature a vast chemical laboratory in which all kinds of composition and decompositions are formed.

This theory [the oxygen theory] is not as I have heard it described, that of the French chemists, it is mine (elle est la mienne); it is a property which I claim from my contemporaries and from posterity.

We must trust to nothing but facts: these are presented to us by nature and cannot deceive. We ought, in every instance, to submit our reasoning to the test of experiment, and never to search for truth but by the natural road of experiment and observation.

It is almost possible to predict one or two days in advance, within a rather broad range of probability, what the weather is going to be; it is even thought that it will not be impossible to publish daily forecasts, which would be very useful to soci.