The object of this notice is to communicate some recent experiments on diamagnetism, and particularly on the influence of magnetism on polarized light. The following extracts are in the words of the author :— The apparatus I employed in these experiments was an electromagnetic apparatus invented by M.Rumkorf, and described by M.Biot at a meeting of the Academy of Sciences of Paris, and consisting of a powerful electro-magnet, of which the soft iron cylinder is traversed by a hole in the direction of the length of the axis, through which hole the ray of polarized light is made to pass; and the voltaic current which I employed on this occasion was that of seven pair of Grove’s construction. I made my first experiment with a piece of heavy glass, which I received from Faraday himself. In order to assure myself of the exact amount of rotation induced by magnetic action, I caused the ray of light, before it reached the heavy glass , to pass through the system invented by M. Soleil, consisting of two equal plates of perpendicular quartz, placed side by side; the one turning to the right, the other to the left. I ascertained, first of all, the rotation produced by making the current pass sometimes in one direction, and sometimes in the other ; the two rotations, one to the right, the other to the left, thus produced, were exactly the same. Then I compressed slightly the middle part of the piece of heavy glass, in the same manner as one compresses pieces of glass. I was then obliged to turn the eyepiece in a certain direction in order to restore the image to its first condition; in my experiments I always had to turn it, after compression, towards the right. I next made the current pass, first in one direction, then in the other. The general facts which I have observed constantly and without exception are the following :— The rotation produced by the magnet on the compressed piece of heavy glass is not the same to the right as it is to the left: the rotation produced by the magnet is considerably greater in the direction of the rotation produced by compression than it is in the contrary direction: the rotation produced by the magnet on the compressed heavy glass, and in the direction of the rotation produced by the compression, is greater than that produced by the same magnet on glass which has not been compressed, and the rotation in the contrary direction is less. The following are the numerical results . “In one experiment I obtained on a piece of heavy glass not compressed, 3° of rotation to the right or to the left, according to the direction of the current: on slightly compressing the glass, I had to turn to the right the eyepiece to 4°, 5°, and even to 8° in order to restore the image to its first condition. In closing the circuit, the rotation produced in the same direction as that due to compression wras 3½° or 4°, while the rotation produced in the contrary direction was from 2° to 1½°. On ceasing to compress the glass, I obtained the same phenomena as I had observed before the compression.