The pony express riders, to whom reference has already been made, rode over trails and cow-paths made by herds of buffaloes, deer, or cattle. To-day, however, as part of our post-office appropriations, large sums are included for construction and keeping in repair public roads and routes used by different branches of our mail service. For the present year there was appropriated for carrying out the provisions of the Federal Highway Act the sum of $75,000,000 for what is known as Federal aid to the States in road construction, and $10,000,000 for forest roads for 1923. A comprehensive program has been adopted and, in order that the States may make adequate provisions to meet their share for the Federal appropriations, they know in advance just what Federal appropriation they can depend upon. The total Federal aid funds which have been apportioned to the States from 1916 to 1921 amount to $339,875,000. On February 1, 1922, $213,947,790 had been paid on actual construction, leaving a balance for new construction of $125,927,214. Between February 1 and July 1 of this year about $40,927,000 more was put into construction. _Washington Headquarters_ The main Post-office Department Building is located at 11th Street and Pennsylvania Avenue, N.W., Washington, D.C. What is known as the City Post-Office Building is at North Capitol Street and Massachusetts Avenue in that city, and the mail equipment shops are located at 5th and W Streets, N.E. The total number of employees in the General Department is 2025. The clerks throughout the department, in character, intelligence, and dependability, are above the average. Not only must postal clerks be familiar with the location of several thousand post-offices, but they must know on what railroad each post-office is located, through what junction points a letter despatched to that office must pass, and many other important details. The schedules of railroads affect the method of despatching mail, and these are constantly changing so that postal clerks must be up to the minute on all schedules, etc. _Red Corpuscles for Our Postal Arteries_