A great variety of improvements for looms have been illustrated and described in the Scientific American, and new devices are coming under our notice almost daily. Several very important improvements have lately been invented by James Greenhalgh, Jr., of Water-ford, Mass.; the improvements relate to several parts of the loom, and are too extensive to describe without the aid of engravings. The parts upon which the improvements are made are those which relate to the harness motion and the method of hanging the heddles ; there are also several improvements in the method of constructing and operating the jacks, by which the amount of labor is lessened, and the work performed more perfectly than by those ordinarily in use. The inventor has taken measures to secure a patent.