Clifton, however, ere long became too small a sphere for Davy; and in 1801 an appointment as Assistant Editor of the Journals, Director of the Laboratory, and Assistant Lecturer (with a view to his ultimately becoming the Professor of Chemistry) to the then newly-founded Royal Institution, in London, was joyfully accepted; his salary being fixed at 100 guineas a year, with a room, and coals, and candles. The Duchess of Gordon, amongst other leaders of fashion, attracted by his youth and simplicity, as well as by his enthusiasm and eloquence, took him by the hand; and his success became assured. Compliments, invitations, and presents, Dr. Paris tells us, were showered upon him from all quarters; his society was courted by everybody, and all were proud of his acquaintance. In 1802 he commenced a long series of lectures before the Board of Agriculture, on the connexion of Chemistry with Vegetable Physiology, which have been translated into almost every European language: in fact, Sir Humphry has been well named the father of Agricultural Chemistry.[106] In 1803 he obtained the enviable distinction of being elected a Fellow of the Royal Society, and two years afterwards, having become a Member of the Royal Irish Academy, he found himself a correspondent of all the chief scientific men of the day.
Davy's début as a lecturer at the Royal Institution appears to have been highly successful; 'the sparkling intelligence of his eye,[107] his animated manner,' according to one critic, and 'his youth, his natural eloquence, his chemical knowledge, his happy illustrations, and well-conducted experiments, excited universal attention and unbounded applause.' It has been well said that 'under his touch the coldest realities blossomed into poetry.' But the real secret of his success was this—that he was master of his subject; and that his whole heart was in his work. His mode of life, his brother tells us, was at this time extremely simple, his fare frugal, his rooms slightly furnished, and the only 'thing of beauty' which they contained was an exquisite little porcelain Venus, the gift of his early friend Wedgwood, with whom he was associated in some of the very first attempts made in this country in the art of photography.
In 1806 and 1807 he was selected to deliver the Bakerian Lecture (the subject chosen being the 'Chemical Agencies of Electricity')—an honourable distinction—leading, as it probably did, to his promotion in the latter year to the posts of Secretary to the Royal Society, and Member of the Council. Of this paper Dr. Whewell said, 'It was a great event—perhaps the most important event of the epoch under review,' and as such 'it was recognised at once all over Europe.' Probably no man's life was happier than Davy's at this period; his income was ample, his work was his pleasure, and his disposition was happy and sanguine. Whilst holding constant and friendly intercourse with his brother philosophers at home and abroad,[108] he had also plenty of time for relaxation; and made several pleasant excursions to Scotland[109] and Ireland; everywhere sketching, making notes, fishing, or pursuing his inquiries amongst the natives with a vivid pertinacity and good-nature which at once astonished and delighted them. His brother (who used occasionally to occupy an adjoining bedroom at the Royal Institution) tells how Humphry might frequently have been heard during the night addressing in fervid tones some imaginary audience, or humming aloud an angler's song. Indeed, it might almost be said that during this period one cloud only darkened his horizon. He was seized with typhus fever, caught during an inspection of Newgate Prison, which he visited with a view to arranging for its disinfection; but, as Dr. Dibdin remarked in his introductory lecture to the Institution:
'—— Death his dart
Shook, but delayed to strike.'
During Davy's visits to Ireland in 1810 and 1811 he lectured before the Dublin Society, and whilst in the Irish metropolis had conferred upon him by Trinity College the honorary degree of Doctor of Laws. During the first week 550 tickets for his lectures were sold at 2 guineas each, and the price ultimately rose to from 10 to 20 guineas. His own pecuniary remuneration was also handsome; in the former year he received 500 guineas, and in the latter £750.
The result of his researches during the eleven years whilst he was officially connected with the Royal Institution may, Dr. Davy thinks, be conveniently divided into two portions, viz., the earlier one, terminating with his great discovery of the decomposition and recomposition of the fixed alkalies, by the aid of an enormously powerful voltaic pile which he had specially constructed for him, and the cost of which was defrayed by subscription—the reward of his triumphant and all-important electro-chemical researches; and the later period, which re-established the simple nature of chlorine. His views on these subjects were adopted by all the leading chemists of the age; and, with few exceptions, were after a short time promulgated in the schools. To the theory of tanning he also gave much attention, experimentally wearing for some time one shoe tanned with oak bark, and the other with catechu. He published the results of his inquiries in the 'Philosophical Transactions' for 1803.
It is not uninteresting here to note that Davy, on becoming connected with the Royal Society, did not entirely relinquish his intentions of prosecuting—what might probably have been a more lucrative career—his original profession of medicine. But not even such a prospect—nor even that of an illustrious career in the Church—(to which it is said the Bishop of Durham and others, charmed by his eloquence as a lecturer, urged him)—could draw away his affection from science. And he was not without his reward; for he had the satisfaction of reading in Cuvier's address to the French Institute, whose members were of course rival scientists, that—'Davy, not yet thirty-two, in the opinion of all who could judge of his labours, held the first rank among the chemists of this or of any other age.'
The month of April, 1812, was an eventful one in Davy's life. It saw his retirement from the post of Secretary to the Royal Society; it saw him receive the honour of Knighthood, then rarely bestowed upon men of science;[110] and last, but not least, it saw him married to Mrs. Apreece, whose maiden name was Jane Kerr (of Kelso), a wealthy, amiable, and intellectual widow, to whom he appears to have been devotedly attached: he described her, in a letter to his mother, announcing the intended marriage, as 'a woman equally distinguished for virtues, talents, and accomplishments;' and to his brother as 'the most amiable and intellectual woman I have ever known.' To this tribute to her worth it may be added that, when Scott went on his tour to the Hebrides, his 'dear friend and distant relation,' Mrs. Apreece (afterwards Lady Davy), went with the family party: she had been, Scott says in one of his letters, 'a lioness of the first magnitude in Edinburgh' during the preceding winter. And when writing to Byron, inviting him to Abbotsford, Sir Walter mentions as one of the visitors who made his home attractive: 'The fair, or shall I say the sage, Apreece that was, Lady Davy that is, who is soon to show us how much science she leads captive in Sir Humphry.'