_Mailing Division--Transportation Section_ The Transportation Section, under Assistant Superintendent of Mails John J. McKelvey, is closely coördinated with the motor vehicle section. The duty of this section is to effect the loading of the vehicles and to arrange the schedules so as effectively to move the mails from the point at which they are made up to their despatch by train, or delivery to some station or group of stations. How great is the volume of mail handled will be understood when it is said that from the General Post-office alone the average number of pouches received and despatched daily is approximately 16,000, while the average number of sacks received and despatched is approximately 80,000. The pouches contain first-class mail and the sacks contain mail of other classes. The average number of pieces received and despatched daily, too large to be inserted in either sacks or pouches, is approximately 15,000. At each of the great terminals there are very extensive platforms; the one at the City Hall Station is a block long; that at the General Post-office two blocks long, and these platforms are under the control of the transportation department. During the hours when the mails are being despatched they are among the busiest spots in the postal system. As many as 1200 trucks commonly receive and discharge mail from the General Post-office platform daily. Other platforms are correspondingly busy. _The Pneumatic Tubes_ The pneumatic tube service has now been resumed between the General Post-office, the terminals, and certain of the principal stations of the New York postal system, which was discontinued June 30, 1918, owing to the antagonism to this method of transportation on the part of the then postmaster-general, Mr. Albert Burleson. Legislation has been enacted and departmental action taken within the last year to bring about the resumption of operation of this valuable system. The pneumatic tubes form what is practically a great loop running north in two branches from the City Hall. One branch goes up the east side of the city, east of Central Park, and the other up the west side, west of Central Park, the two lines being joined together at 125th Street by a line running east and west. This loop and its extensions link the General Post-office and the following named stations: A, C, D, F, G, H, I, J, K, L, N, O, P, U, V, W, Y, Grand Central, Madison Square, Times Square, Wall Street, City Hall, and Varick Street. The City Hall Station is also connected with the Brooklyn General Post-office. The pneumatic tubes are located four to six feet below the surface of the city's streets, and through these tubes cylindrical steel containers are forced by compressed air. The containers are approximately seven inches in diameter and twenty-one inches long, and the pressure of air is sufficient to impel them at the rate of about thirty miles per hour. Containers carry from 500 to 700