It is almost impossible to make a clear and accurate statement about chemistry without resorting to the language of weights and measures.
It is almost impossible to make a clear and accurate plan of scientific research without first performing the experiments.

Scientists
Antoine Lavoisier
French chemist born in 1743 who discovered the law of conservation of mass, named oxygen, and demolished phlogiston theory. He is called the father of modern chemistry. Executed during the French Revolution.
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Antoine Lavoisier's Other Quotes
Related Quotes
An experiment is a question which science poses to Nature, and a measurement is the recording of Nature's answer.
-- Max Planck
I frame no hypotheses.
-- Isaac Newton
The seeker after truth is not one who studies the writings of the ancients and, following his natural disposition, puts his trust in them, but rather the one who suspects his faith in them and questions what he gathers from them.
-- Ibn al-Haytham
Measure what is measurable, and make measurable what is not so.
-- Galileo Galilei
The first principle is that you must not fool yourself -- and you are the easiest person to fool.
-- Richard Feynman
The knowledge of anything, since all things have causes, is not acquired or complete unless it is known by its causes.
-- Avicenna