t was in London, about two years ago, that the question of "the end of books" and their transformation into something quite different was agitated in a group of book-lovers, artists, men of science and of learning, on a memorable evening, never to be forgotten by anyone then present.
 

We had met that evening, which happened to be one of the scientific Fridays of the Royal Society, at a lecture given by Sir William Thomson, the eminent English physicist, professor in the University of Glasgow, universally known for the part he took in the laying of the first transatlantic cable.

On this Friday evening Sir William had announced to his brilliant audience of savants and men of the world that the end of the terrestrial globe and of the human race was mathematically certain to occur in precisely ten million years.

Taking his stand on the theory of Helmholtz, that the sun is a vast sphere in process of cooling, and, by the law of gravity, of shrinking in proportion as it cools, and having estimated the energy of the solar heat as four hundred and seventy-six million horse-power to the superficial square foot of its photo- sphere, Sir William had demonstrated that the radius of the photosphere grows about one-hundredth part shorter every two thousand years, and that it is therefore quite possible to fix the precise hour when its warmth will be insufficient to maintain life on our planet.
 

The great philosopher had surprised us no less by his treatment of the antiquity of the earth, which he showed to be a Anquestion of pure mechanics. In the face of geologists and naturalists be gave it a past history of not more than a score of millions of years, and showed that life had awakened upon earth in the very hour of the sun's birth--what- ever may have been the origin of this fecundating star, whether the bursting of a pre-existing world or the concentration of nebulae formerly diffused. 

We had left the Royal Institute deeply moved by the great problems which the learned Glasgow professor had taken such pains to resolve scientifically for the benefit of his audience. With minds in pain, almost crushed by the immensity ofthe figures with which he had been juggling, we were silently walking home, a group of eight different personalities