of the Royal Institution that the degree of domestic civilization which prevails on the third floor of the building is quite as high and more potentially attractive than the stage of scientific civilization which rules in the theatre, the libraries, and the laboratories of the floors below. Like most Scotchmen, however, Professor Dewar is simple in his tastes, and is more deeply stirred by a frozen gas or an antique bronze than anything in the way of bisques or _suprêmes_. His heart, which shows no signs of low temperature, is mainly in his laboratory, and he leads the way there, down a flight of stone steps to the basement, with a readiness that very clearly exhibits his latent enthusiasm. [Illustration: THE LABORATORY OF DAVY AND FARADAY AT THE ROYAL INSTITUTION.] Moreover, it is a laboratory eminently calculated to excite the enthusiasm of anybody, being, in fact, the most famous laboratory known to chemical science. The workshop of Sir Humphry Davy, Michael Faraday, and Doctor Thomas Young, to say nothing of lesser and still famous men, it is a nest in which more great discoveries have been hatched than any other of its kind on earth. Here it was that Young conducted the experiments which gave us the undulatory theory of light. Here Davy, covering, nearly a hundred years ago, almost the whole field of chemistry and electricity, made clear those principles which science and applied science since his time have developed to the marvellous degrees of to-day. A little room leading to the right of the main laboratory was the scene of all Faraday’s experiments in magnetism, and a cellar on its south side is known to this day as “Davy’s Froggery,” from the fact that Davy kept in it hundreds of live frogs for use in his experiments. Professor Dewar, whose sense of the inspiration of his surroundings is clearly deep, dwells upon them with interest, and tells how on one occasion a barrel of live frogs, imported by Davy from France, burst at the docks, causing astonishment there and consternation in the laboratory when Davy learned of his loss. It was in this laboratory that Faraday first liquefied chlorine gas, sending thereupon that famously curt note to Dr. Paris, the biographer of Davy, in 1823: “DEAR SIR:--The oil you noticed yesterday turns out to be liquid chlorine. “Yours faithfully, “MICHAEL FARADAY.”