Eye

The visual apparatus con: sists of the globe of the eye, of the muscles which move it, and of its appendages, which are the eyelids anc eyebrows, and the lachrymal appara: tus. The eye in its different parts is subject to various diseases and affections, some of them common to othet parts of the body, others peculiar tc itself. When the transparency of the cornea, the crystalline lens, or any of the humors, is destroyed, either partially or entirely, then will partial o1 total blindne follow, since no image can be formed upon the retina; but although all the humors and the cor. nea be perfectly transparent, and retain their proper forms, which is likewise nece ary to distinct vision, yet. from weakne or inactivity of ‘the optic nerve, or injury of the central ganglia with which it is connected. weakne of sight or total blindne may ensue. To the first cla belong those diseases called cataracts, ophthalmia, etc., and to the second amaurosis or gutta serena, etc. Although a person may not be under the influence of any of these diseases, yet defective vision may arise from the eyeball being so elongated that an image is formed before the rays reach the retina (a defect known as short sight or myopia), in which case distinct, vision will be procured by interposing a con:- cave lens between the eye and the object # such a curvature as shall cause fhe rays that pa through the crystalline lens to meet on the retina; or the eyeball may be short, so that the opposite condition arises, a defect which is corrected by convex lenses, Eylan, a town of 3,544 inhabitants, 23 miles S. of Konigsberg by rail, Here Napoleon encountered the allies — Ru ians and Pru ians —~ under Benningsen, Feb. 8, 1807. Darkne came on while the contest was still undecided; but as Napoleon had a considerable force of fresh troops close at hand, the allies retired during the night on Konigsberg. Their lo is estimated at about 20,000; that of the French at 10,000, but must have been considerably greater. This place is called Preu isch-Eylau, to distinguish it from Deutsch-Eylau, a town of 4,574 inhabitants, 89 miles N. E.