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Updated: June 16, 2025
He found that the first volume of the "History of Human Ignorance," testing of the early ideas of mankind and their psychological reasons, was completely ready for the press; and all the notes and literary sources for the two following volumes only needed putting together to bring the work up to the end of the eighteenth century, and the experiments of Lavoisier, from which the indestructibility of matter was deduced.
If any physiological facts can be proven at all, then I feel quite sure of your verdict upon my side. There is no one thing that goes so far to prove the theory of Lavoisier regarding the action of oxygen in the tissues and capillaries for converting carbon into carbonic acid gas instead of the lungs, as held prior to that time, and still held by many who are not posted in late experiments.
Doubtless a vigorous error vigorously pursued has kept the embryos of truth a-breathing: the quest of gold being at the same time a questioning of substances, the body of chemistry is prepared for its soul, and Lavoisier is born. But Mr.
We owe the important knowledge of those proportions to the celebrated and unfortunate Lavoisier, who has proved, by the most accurate experiments, that there must be 100 parts of dry sweet substance, or sugar 400 parts of water 10 parts of ferment, or liquid yeast, which is reduced to 8 7-10ths of dry matter.
Not only did Lavoisier realise and act on this principle, he also measured quantities of substances by the one practical method, namely, by weighing; and by doing this he showed chemists the only road along which they could advance towards a genuine knowledge of material changes.
Lavoisier saw the great importance of Priestley's discovery; he repeated Priestley's experiment, and concluded that the air, or gas, which he refers to in his Laboratory Journal as "l'air dephlogistique de M. Priestley" was nothing else than the purest portion of the air we breathe. He prepared this "air" and burned various substances in it.
Adjoining to the Palais de Justice, is the famous prison, so dreaded in the early periods of the revolution, called From this fatal abode, neither talent, virtue, nor patriotism could, at one time, secure those who possessed such enviable qualities. Lavoisier, Malsherbes, Condorcet, &c. were here successively immured, previously to being sent to the guillotine.
Lavoisier supposed that the stages in the complete reaction between mercury and nitric acid were these: the withdrawal of oxygen from the acid by the mercury, and the union of the compound of mercury and oxygen thus formed with the constituents of the acid which remained when part of its oxygen was taken away.
Although Lavoisier recognised that not every compound of oxygen is an acid, he taught that every acid is a compound of oxygen. We know now that many acids are not compounds of oxygen, but we have not yet sufficient knowledge to frame a complete definition of the term acid.
Lavoisier then mixed measured volumes of oxygen and "nitrous air," standing over water; a red gas was formed, and dissolved in the water, and Lavoisier proved that the water now contained nitric acid.
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