Since it is the very substance of the animal, it is the blood which transports the fuel.If the animal did not habitually replace, through nourishing ….

As ideas are preserved and communicated by means of words, it necessarily follows that we cannot improve the language of any science, without at the ….

The impossibility of separating the nomenclature of a science from the science itself, is owing to this, that every branch of physical science must c….

We may lay it down as an incontestible axiom, that, in all the operations of art and nature, nothing is created; an equal quantity of matter exists b….

In performing experiments, it is necessary... that they be simplified as much as possible, and that every circumstance that could complicate the resu….

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 ….

Imagination, on the contrary, which is ever wandering beyond the bounds of truth, joined to self-love and that self-confidence we are so apt to indul….

Vegetables are organized bodies that grow on the dry areas of the globe and within its waters. Their function is to combine immediately the four elem….

Nothing is lost, nothing is created, everything is transformed.

Nothing is born, nothing dies..

I am young and avid for glory..

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

Thus, while I thought myself employed only in forming a Nomenclature, and while I proposed to myself nothing more than to improve the chemical langua….

The whole art of making experiments in chemistry is founded on the principle: we must always suppose an exact equality or equation between the princi….

In every combustion there is disengagement of the matter of fire or of light. A body can burn only in pure air [oxygen]. There is no destruction or d….

Mathematicians come to the solution of a problem by the simple arrangement of the data, and reducing the reasoning to such simple operations, to judg….

One succeeds in obtaining an equivalent production at a lower price by improving the arts, trades and agriculture and by developing the physical and ….

I have had a fairly long life, above all a very happy one, and I think that I shall be remembered with some regrets and perhaps leave some reputation….

It required 85 parts by weight of oxygen and 15 parts of hydrogen to compose 100 parts of water..

The art of drawing conclusions from experiments and observations consists in evaluating probabilities and in estimating whether they are sufficiently….

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 ….