Davy died at Geneva before he had completed his fifty-first year, no doubt from over-exertion and the unhealthy character of the researches he prosecuted so recklessly. Assiduous as he was in his devotion to his favourite science, he found time also to master several continental languages; to keep himself well acquainted with, and also to contribute to the literature of the day; and to indulge his passion for fly-fishing, at which he was a keen and practised adept.

Eminent as were the talents of Sir Humphrey Davy, and valuable as his discovery of the safety-lamp has proved, it is but fair to own that his credit to the latter has been very openly denied. Two persons of scientific celebrity have been put forward as the real inventors of the safety-lamp—namely, Dr. Reid Clanny of Newcastle, and the great railway-engineer, George Stephenson. Of Clanny's safety-lamp a description appeared in the Philosophical Transactions in 1813—that is, ten years before Sir Humphrey made his communication to the Royal Society. However, it was a complicated affair, which required the whole attention of a boy to work it, and was based on the principle of forcing in air through water by the agency of bellows.

Stephenson's was a very different apparatus. In its general principle it resembled Davy's, the chief difference being, that he inserted a glass cylinder inside the wire-gauze cylinder, and inside the top of the glass cylinder a perforated metallic chimney—the supply of air being kept up through a triple circle of small holes in the bottom.

Stephenson's claim has, of course, been disputed by the friends and admirers of Sir Humphrey Davy; but Mr. Smile has conclusively proved that his lamp, the "Geordy," was in use at the Killingworth collieries at the very time that Davy was conducting the experiments which led to his invention. It is not to be inferred, however, that Davy knew aught of what Stephenson had accomplished. It seems to be one of those rare cases in which two minds, working independently, and unknown each to the other, have both arrived simultaneously at the same result.