_M. Ader’s Electrophone._--M. Ader has recently constructed a remarkable telephonic instrument, which reproduces speech and song in a quite exceptional and simple way. It consists of a drum 15 centimètres in diameter, covered with parchment at one end only. Six small tin armatures, one centimètre in length and two millimètres in width, are fixed in the centre of the parchment in a circle six centimètres in diameter. Six microscopic electro-magnets, whose distance from the armatures can be regulated by a screw, are placed opposite the armatures within a wooden circle. The magnets are horseshoe, with branches 12 millimètres long and 4 millimètres in diameter, including the coils, and the magnetic core is 1½ millimètre thick. They are all in connection, and act simultaneously under the sole influence of the battery current. The sender is the same as that of M. Ader described before. With this instrument speech may be heard at a distance of six or seven yards, and songs are much more distinctly heard than in the singing condenser. Owing to the simplicity of the arrangement, the instrument is not costly. The extraordinary effects of this telephone are due to the small size of the electro-magnets, which, as we believe, produce much more rapid magnetic effects than those of larger size. M. Ader has also made a small ordinary telephone based on this principle, of which the sounds are much stronger than in others. _Modification of Bell Telephone._--Mr. Gower has recently made a new system of telephone without a battery, which not only reproduces speech loudly enough to be heard at the distance of eight or nine yards from the instrument, but will also transmit it when the speaker is at a moderate distance from the sending instrument. In this latter case, indeed, the receiving telephone must be brought close to the ear. Although this double problem had already been solved by the use of telephones with microphonic senders, the results furnished by the instruments in question are still more curious, since they are obtained without batteries, and are even more distinct.