_The Author._ I am about to explain myself on this point. The absolute fixity of the sun and the stars was an astronomical principle, which, in the time of Newton, appeared to be indubitable. But science never stands still. Observations made in the present century have proved that the fixity, the immobility of the sun is only relative. The truth is that the sun, and with him the entire system of planets, asteroïds, satellites, and comets, which he carries, in his train, change their places, very slightly no doubt, but still appreciably. Our sun appears to advance slowly, with all the planetary family, towards that part of the sky in which the constellation of _Hercules_ is situated, at the rate of 62,000,000 of leagues each year, or two leagues each second, describing an orbit which comprehends millions of centuries. That which is the case with our sun is equally the case with the other suns, that is to say, the stars. This general motion of translation must be common to all the stellar systems, and it is indubitable that the countless millions of solar systems suspended in infinite space, are moving more or less quickly towards an unknown point in the sky. Now, there is nothing to forbid the supposition that all these circles or ellipses traced by myriads of solar systems, have a common centre of attraction, towards which our system and all the others gravitate. Thus, all these celestial bodies, without exception, all this ant-hill of worlds which we have enumerated, may be turning round one point, one centre of attraction. What forbids us to believe that God dwells at this centre of attraction for all the worlds which fill infinite space? _Theophilus._ Now I understand your thought, and I am struck by its grandeur. This God, placed at the mathematical centre of the worlds which compose the universe, this infinite intelligence, throned in the centre of the infinite universe, and presiding over the movements of all the innumerable phalanxes of heavenly bodies which our imagination can conceive, responds to the idea which we form of God, if we venture to face the awful personality of His Omnipotence. You have done well to develop this theory in your work. It will be in harmony with the kind of religious spirit which animates it, and which is, besides, the expression of the desires, and the aspirations of the men of our time.