Posters 3804 Post Office ings depository offices, ami ertTiled a board of trustees, consistina of the Postmaster Gen- eral, the Secretary of the Treasury, and the Attorney General, with power to designate such post office* a» they might select to be depository offices, anil to ha\'e supervision and control of the same. The Act provides that any person of the age of ten years or over may, in his or her own name, open an account in any postal savings bank deposi- tory; but no person can have more than one account in his or her own right. Accounts may be opened by the deposit of a dollar or a larger sum in multiples of a dollar, or by purchasing a postal savings card for 10 cents and affixing thereto, at convenience, nine specially prepared postal savings stamps costing 10 cents each. In 1941 there wci\ about 3,000,000 depositors. Posters, advertising sheets of considerable size, usually printed and often illustrated, and bearing large letters so that when posted on a wall, or any similar spot, they may easily be read. Poster work in the United States had its origin in the old circus and theatrical show bills printed from wooden blocks. The use of the lithographic stone was introduced in the early 'So's, but it was not until after 1890 that modern poster work took its rise in this country with the development of such poster artists as Maxfield Parrish, Louis Rhead, Will H. Bradley, Edward Penfleld, Ethel Reed, J, C. Lcyendeckcr, Will H. Low, George Wharton Edwards, and others. Post- ers are not now as noticeable in the United States as they were some years ago; but the poster character of design is introduced far more extensively in advertising and cover reproduction, even entering the field of il- lustration. Post Impressionism, a name given to the art development following Impressionism and representing not a continuation but a reaction from the former movement. It combats the attitude that art is a matter of imitation, and holds rather that its chief concern is creation; that its aim, as has been said, is 'not at illusion, but at reality/ Among the acknowledged leaders of the movement arc Cezanne, former- ly associated with the Impressionists, Gauguin Van Gogh, and Matisse. Of the various mani- festations of Post Impressionism the two which have attracted the greatest attention are Cubism and Futurism. Post Mortem, or Autopsy, an examina- tion after death to ascertain the condition o; the various parts of the body, to note any changes in the organs, and to determine is far as possible, the cause of such changes. Post Office, a government service designed primarily for the despatch of written com- munications, but comprising in modern times i number of other services, as tiie transmis- -ion of merchandise and of printed matter, >ostal savings banks, the issue of money or- lers, and in some countries telegraph and tele- phone facilities. In America the first step in the establishment of a postal system was the appointment by the General Court of Massa- chusetts, in 1630, of an official to take charge of the delivery of letters. Under the Constitution, a postal service was authorized by Congress in 1780, and Samuel Osgood became the first Postmaster-General of the new station, the office being subordinate to the Treasury Department. Seventy-live lo- cal post offices were in existence at that time, and the mails were carried on 1,87$ miles of road at an annual cost of less than $25,000. In .56 the postal service was reorganized on its present financial basis. In 1847 the use of postage stamps was officially authorized; and in the same year the first postal treaty with a foreign government was concluded with Bremen, then an autonomous German state. On the basis of receipts, post offices are di- vided into four classes, as follows: first class offices, with gross receipts exceeding $40,000 per annum; second class, with receipts from $8,000 to $40,000; third class, from $1,500 to $8,000; and fourth class, less than $1,500. Postmasters in the first three classes are ap- pointed by the President with the advice and consent of the Senate. Fourth class postmast- ers arc appointed by the Postmaster-General, those receiving annual compensation of $500 or over being appointed after competitive ex- amination, and the others on the recommenda- tion of the post oftkc inspectors after personal investigation. Clerks and letter carriers in places where free delivery exists, assistant postmasters at first and second class offices, and all clerical positions at the same offices arc subject to civil service rules- Railway Mail Service.—Mail xvas first car- ried by rail in 1834, but the railway mail serv- ice, providing facilities for the separation and distribution of mail on the cars while inmotion, dates from 1864, when George B. Armstrong of Chicago opened the first railway post of- fice in the United States on the Chicago and Northwestern Railway, from Chicago to Clin- ton, la. The experiment proving successful, the system was rapidly extended to other lines, and in 1875 the fast mail service was inaugu- rated. Air Mail.—A daily transcontinental air