His next researches were chiefly on electro-magnetism and the protection of the copper sheathing on ships' bottoms. At the end of 1826 his health failed seriously. He went to Italy; resigned, in July, 1827, the Presidency of the Royal Society; came back to England, longing for "the fresh air of the mountains;" wrote and published his "Salmonia, or Days of Fly-fishing." In the spring of 1828 he left England again. He was at Rome in the winter of 1829, still engaged in quiet research, and it was then that he wrote his "Consolations in Travel; or, the Last Days of a Philosopher." His wife, who shone in London society, did not go with him upon this last journey, but travelled day and night to reach him when word came to her and to his brother John, who was a physician, that he had again been struck with palsy and was dying. That stroke of palsy followed immediately upon the finishing of the book now in the reader's hand. Davy lived to see again his wife and brother, rallied enough to leave Rome with them, and had got as far as Geneva on the 28th of May, 1829. He died in the next night. H. M. A NOTE, _Prefixed to the First Edition, by Sir Humphry Davy's Brother_. As is stated in the Preface which follows, this work was composed during a period of bodily indisposition;--it was concluded at the very moment of the invasion of the Author's last illness. Had his life been prolonged, it is probable that some additions and some changes would have been made. The editor does not consider himself warranted to do more than give to the world a faithful copy, making only a few omissions and a few verbal alterations. The characters of the persons of the dialogue were intended to be ideal, at least in great part such they should be considered by the reader; and, it is to be hoped, that the incidents introduced, as well as the persons, will be viewed only as subordinate and subservient to the sentiments and doctrines. The dedication, it may be specially noticed, is the author's own, and in the very words dictated by him, at a time when he had lost the power of writing except with extreme difficulty, owing to the paralytic attack, although he retained in a very remarkable manner all his mental faculties unimpaired and unclouded. JOHN DAVY. _London_, _January 6th_, 1830. TO THOMAS POOLE, ESQ. OF NETHER STOWEY IN REMEMBRANCE OF THIRTY YEARS OF CONTINUED AND FAITHFUL FRIENDSHIP. AUTHOR'S PREFACE. Salmonia was written during the time of a partial recovery from a long and dangerous illness. The present work was composed immediately after, under the same unfavourable and painful circumstances, and at a period when the constitution of the Author suffered from new attacks. He has derived some pleasure and some consolation, when most other sources of consolation and pleasure were closed to him, from this exercise of his mind; and he ventures to hope that these hours of sickness may be not altogether unprofitable to persons in perfect health.