Davy held that if the battery is strong enough any compound may be dec — Humphry Davy

"While he was recording these splendid discoveries in his second Bakerian lecture, Mr Davy was thrown into a state of fever, and laboured under the deepest apprehension that he would die before he had finished his paper. This state of his mind was the prelude to a severe and long-protracted disease, which his friend and physician Dr Babington considered as the result of over-fatigue and excitement from his experimental labours and discoveries. During five weeks he struggled between life and death, and it was not till the end of nine weeks that his convalescence commenced. The anxious enquiries of all ranks exhibited the personal regard which he commanded, and the public importance which was attached to his recovery."

"Berthollets conclusion that chlorine is oxymuriatic acid was universally accepted until Gay-Lussac and Thénard in 1809 endeavoured to decompose the gas and failed. They concluded that it contained water because it yielded water when passed over litharge. Their researches read to the Institute in 1809 led Davy to investigate muriatic acid (hydrochloric acid) gas, which in 1808 he had shown to be decomposed by potassium, with evolution of hydrogen. In 1810 he proved that chlorine is an element, and that muriatic acid gas is a compound of chlorine and hydrogen. He thus overturned the oxygen-acid theory, and demonstrated that muriates are compounds of metals with chlorine. He pointed to the fact that some acids, such as sulphuretted hydrogen, contain no oxygen, and argued that muriatic acid gas was one of these, chlorine in it taking the place of oxygen. ...The conclusions of Davy were at first doubted, but when iodine and bromine were also discovered, Gay-Lussac and his followers adopted Davys views. The latter worked out fluorine, and proved that hydrofluoric acid (HF) contains no oxygen. Berzelius also opposed Davy until the discovery of iodine, but embraced the latters opinion in 1820."

"The general properties and chemical activities of potassium and sodium are so very similar that as a matter of commercial production that metal which can be most economically obtained is necessarily the one most largely manufactured, and of the two that metal is sodium. To-day, sodium is made by thousands of tons, and by a process which in principle is identical with that by which it was first made by Davy, i.e., by the of fused caustic soda."

"Every new discovery may be considered as a new species of manufacture, awakening moral industry and sagacity, and employing, as it were, new capital of mind."

"You write with great eloquence and truth on the effects of mountain scenery on the mind. Whatever exalts the imagination purifies the affections; but even our noblest and best thoughts have their archetypes in sensation. The eye is the most perfect of all the senses, and the one that most feeds the intellect. When surrounded by the grand forms of nature, we give to earth something of the indefinite character of heaven. Great objects excite great thoughts; the standard of our being rises; all our low and grovelling associations disappear; and our sympathies are more strongly awakened with regard to the moral, sublime, the excellent, the decorous, and the great in philosophy. We are more fitted to enjoy the blaze of light of Milton, to pass into the -forms of humanity with Shakespeare, and to move through the heavens with Newton. ... I am leading a truly philosophical life of activity, and the constant pursuit of an object, the elements of such a life. Such moments as I am now passing in the crowded city, prove to me how fitted our being is for independent and solitary thoughts; how much its strength depends upon its own efforts, and how little it owes to general society. Pray do not forget me, and believe me to be, very truly and affectionately, yours..."

"I need only remind you of Davys great researches: nitrous oxide; electric conduction and decomposition—resulting, on the one hand, in the separation of potassium and sodium, the decomposition of the earths following as a necessary consequence, and on the other in the electro-chemical theory; iodine and chlorine—resulting in the extension and confirmation of the word element, the discovery of the so-called hydrogen acids, and the important modification of the French theory of the constitution of acids; the investigation of gaseous explosion and of flame, and the invention of the safety lamp. These are the contributions to science which stand out more prominently in connection with Davy. But over and above all this is the peculiar manner of his discoveries. He was no patient plodder. He did not elaborate his work in minute detail. He dashed it off in broad masses; but just on that account there has never been anyone to follow up his investigations. Davys mantle fell on no one, not even on Faraday."