ANOTHER important scientific discovery, or, perhaps better, invention, has just been made by Professor Wolcott Gibbs, of our University, and is known as the Ammonic Nitrate Battery. This is the second improved species of battery that Professor Gibbs has invented, the first being the Bichromate Potash Battery, which has already taken the place of the old Bunsen Battery on the Western Union Telegraph lines. These batteries are in form like the Bunsen Battery; the Bichromate Battery, though improving little on the Bunsen in cleanness, yet gets rid of the fumes which make the latter battery so disagreeable for use. The Ammonic Nitrate Battery gives forth no fumes, and is perfectly clean, is more constant than the Bunsen, and of about the same strength. In the glass cell are used sulphuric acid and water, with zinc; and in the porous cup gas carbon and a saturated solution of ammonic nitrate in nitric acid. The important improvements made by Professor Gibbs in the way we have indicated will probably result in a very general substitution of the Ammonic Nitrate batteries in place of the inferior kinds now in use.