I am further under very special obligations to Dr. Humphry D. Rolleston, the grand-nephew of Sir Humphry Davy, for much valuable material, procured through the kind co-operation of Miss Davy, the granddaughter of Dr. John Davy. This consisted of letters from Priestley, Kirwan, Southey, Coleridge, Maria Edgeworth, Mrs. Beddoes (Anna Edgeworth), Sir Joseph Banks, Gregory Watt, and others; and, what is of especial interest to his biographer, a large number of Davy’s own letters to his wife. In addition were papers relating to the invention of the Safety Lamp. Some of the letters have already been published by Dr. John Davy, but others now appear in print for the first time. I am also indebted to Dr. Rolleston for the loan of the portrait representing Davy in Court dress and in the presidential chair of the Royal Society, which, reproduced in photogravure, forms the frontispiece to this book. The original is a small highly-finished work by Jackson, and was painted about 1823. The picture originally belonged to Lady Davy, who refers to it in the letter to Davies Gilbert (quoted by Weld in his “History of the Royal Society”), in which she offers Lawrence’s well-known portrait to the Society, and which, by the way, the Society nearly lost through the subsequent action of the painter. For the references to the early history of the Royal Institution I am mainly indebted to Dr. Bence Jones’s book. I have, moreover, to thank the Managers of the Institution for their kindness in giving me permission to see the minutes of the early meetings, and also for allowing me to consult the manuscripts and laboratory journals in their possession. These include the original records of Davy’s work, and also the notes taken by Faraday of his lectures. The Managers have also allowed me to reproduce Miss Harriet Moore’s sketch--first brought to my notice by Professor Dewar--of the chemical laboratory of the Institution as it appeared in the time of Davy and Faraday, and I have to thank them for the loan of Gillray’s characteristic drawing of the Lecture Theatre, from which the illustration on p. 70 has been prepared. I have necessarily had to refer to the relations of Davy to Faraday, and I trust I have said enough on that subject. Indeed, in my opinion, more than enough has been said already. It is not necessary to belittle Davy in order to exalt Faraday; and writers who, like Dr. Paris, unmindful of George Herbert’s injunction, are prone to adopt an antithetical style in biographical narrative have, I am convinced, done Davy’s memory much harm.