Rouelle on the possibility of transmuting one element to another said, Ordinary chemists doubt the truth of the principles of this science, but they cannot judge in a matter entirely unknown to them. Although I do not wish to cast doubt on the testim

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.

While I thought myself employed only in forming a nomenclature, and while I proposed to myself nothing more than to improve the chemical language, my work transformed itself by degrees, without my being able to prevent it, into a treatise upon the Elements of Chemistry.

He is better known for what he has promised to the sciences than for what he as actually done for them.

The definition of the composition of air ensues from this program of research : atmospheric air is not an element, that is, a simple body, but a mixture of several gases. Approximately a quarter of atmospheric air is composed by dephologisticated or