LIGAMENT 480 LIGHT the splendid system which now extends and in the Philippine Islands. During along the entire coast and lake lines of the United States. On the Great Lukes the life-saving stations are kept open from the begin- ning of navigation in April to its close in December. On the Atlantic Coast they are open from Aug. 1 to June 1, while on the Pacific Coast they are open the year round. In January, 1915, the service was merged with the Revenue Cutter Service and Coast Guard. the World War he commanded the 41st Division from September, 1917, to Janu- BREECHES-BUOY — LIFE-SAVING SERVICE _ LIGAMENT, anything which binds, ties, or unites one thing to another; a bond, a tie. In anatomy, short bands of strong, white glistening fibers by which the bones are bound together. The ligaments in the human body are very numerous, and all have distinctive names. In the plural, in zoology, two appliances, one external and one internal, for holding together the valves of a con- chiferous mollusk. LYLE GUN AND SHOT-LINE LIGGETT, HUNTEB, an American army officer; born at Reading, Pa., in 1857. He was graduated from the United States Military Academy in 1879, and appointed 2nd lieutenant of the 5th United States Infantry in the same year. After seeing service with various infan- try regiments, he reached the rank of major-general in March, 1917. He served m the Spanish-American War GENERAL HUNTER LIGGETT ary, 1918; the 1st Army Corps from January to October, 1918; and from then until April, 1919, the 1st Army. Com- missioned lieutenant-general Oct. 16, 1918. From May to July, 1919, he was in command of the 3d Army on the Rhine. He participated in the second Marne campaign and in the St. Mihiel and Meuse-Argonne offensives. His other assignments included command of the Army War College (1913), command of the Department of the Philippines (1916-1917), and command of the West- ern Department (1917 and 1919). LIGHT, the natural agent which, by acting on the retina, excites in us the sensation of vision. Two leading hypo- theses regarding its nature have been f onned : the one, the omission or corpus- cular theory, which, though supported by the great name of Sir Isaac Newton, has been abandoned, and the other, the un- dulatory theory, which now obtains. The latter assumes the existence every- where through the universe, or the por- tion of it with which we are connected, of an extremely subtle elastic medium, called luminiferous ether, the undulations of which constitute light, and when they impinge on the retina produce vision. The particles agitated are not trans- mitted but only the disturbance. The movements are held to be strictly analogous to the undulations of the at- mosphere which produce and convey sound; or, as the word undulation
