Thus not only does the Aether circulate round the earth, but it also circulates around every other planet, and not only round every other planet, but equally so around every sun and star, as stated in Art. 91. These results are perfectly consistent with philosophical reasoning, and any other result would be inconsistent with the analogies presented to us by the phenomena of the Aether in relation to our earth as ascertained by experiments made by the scientists referred to. Thus for the first time the experiment is brought into harmony with our Philosophy, which up to the present has not been the case, a result which at once stamps the experiment with that validity of truth and fact which will ultimately win for it universal acceptance and favour. We are now in a position to answer some queries regarding the motions of the Aether asked by Herschel in his work on _Astronomy_, p. 345. These I give with the answers opposite. QUERIES. | ANSWERS. | 1. What is the law of density | The Law of Gravitation of the resisting medium which | (Art. 45). surrounds the sun? | | 2. Is it at rest or in motion? | In motion. | 3. If the latter, in what | Rotates round the sun. direction does it move? | | 4. Circularly round the sun | Both, as it circulates round or traversing space? | the sun while that body | traverses space. | 5. If circularly, in what | The plane of the ecliptic. plane? | ART. 95. _Physical Explanation of the Vibration in the Electro-Magnetic Theory of Light._--In Art. 78 we learned that light was an electro-magnetic disturbance in the Aether which was propagated through the Aether, with a finite velocity; and from this we gathered that light waves were nothing more or less than electro-magnetic waves, which were radiated from the sun, out into the Aether on every side. We were unable, however, at that time to give a definite physical conception of the aetherial vibrations, or of the relation of the various types of vibration to each other. Since, however, the development of the Aether from the electric and magnetic standpoint, which has led us up to the fact that the Aether possesses a circulating motion round the sun (Art. 91), the solution of the problem appears probable. I am of the opinion that the physical conception of the various vibrations to each other is now within the region of possibility, and in this article I wish to endeavour to give what seems to me to be a correct and philosophical explanation of this part of the electro-magnetic theory of light, the physical conception of which up to the present has not been generally understood.