2. This school is now established at Annapolis, in the State of Maryland, near Washington. Like the Military Academy, it has its superintendent and professors. The pupils are called midshipmen. They are taught navigation and such other branches of science as are necessary to make them good seamen and naval officers. They are selected upon nearly the same plan as cadets. Each Congressional District in every State and Territory is entitled to send two students to be educated at the Academy. The District of Columbia is also entitled to send two. Besides which, the President is allowed to appoint ten additional ones at large, and three more from the boys enlisted in the navy. 3. After their graduating examination, if they pass, they are commissioned as ensigns in the navy, and rank according to merit. Before admission, they are examined according to the regulations made by the Secretary of the Navy, and must be between the ages of fourteen and seventeen years, sound, robust, and of good constitution. 4. The course of study in this, as well as in the Military Academy, is adapted to the profession which the students are expected to follow—the one in the navy, the other in the army. More are educated at these great national schools than the government needs in time of peace. Many of the graduates are engaged in civil employment. Thus these institutions have been of great service to the country, outside of the army and navy, for they have added to the number of well-educated and scientific men, who may be useful in any of the walks of life. Their graduates elevate the standard of intelligence in the community, especially when they engage in the work of instruction. Both of these institutions are supported at the expense of the government. The tuition and board of cadets in one, and of the midshipmen in the other, costs them nothing. CHAPTER XXVI. THE NAVAL OBSERVATORY. 1. An observatory is a building erected for astronomical purposes, and supplied with the necessary apparatus for studying the heavens. A thorough knowledge of certain portions of astronomy is indispensable to the commander of a vessel, since it is by means of this alone that he can ascertain his exact position on the open ocean out of sight of land. Nautical Science and Astronomy have advanced hand in hand; and to perfect the former as much as possible the United States Government established the Naval Observatory. This institution is located in Washington, and was originated by act of Congress in 1842, and put in operation in 1844.