The clerks on the westerly bound trains are assigned the distributing of mails by route, for all Middle, Western, Southwestern, and Northwestern States, and on the easterly bound trains for the Middle and Eastern States. When such States as New York, Pennsylvania, Ohio, and Illinois, with respectively 3,070, 3,681, 2,603, and 2,568 post-offices, are taken into consideration, some idea may be formed of the work required in preparing a system of distribution, the vigilance required to keep pace with the frequently changing schedules, and the study of the clerks to properly carry its requirements into effect. Beyond Chicago, in the new country, the work of distribution grows less intricate, but the powers of endurance of the clerks are severely tested. On the line between Kansas City, Missouri, and Deming, New Mexico, a distance of 1,147 miles, the clerks ship for a long voyage--five days on the outward trip and the same on the inward, sleeping and eating on the train. There are a number of lines in the far West, on which the clerks do not leave the train for a number of days. Throughout the country the total number of pieces of ordinary mail handled by 3,855 railway postal clerks on the lines, during the year ending June 30, 1883, amounted to 3,981,516,280; the number of errors made in their distribution was 958,478 pieces, or a per centage of correct distribution of 99.97. This minutia of detail is applied to the distribution of a vast bulk of mail. It is estimated that in Boston, Massachusetts, between eighty and one hundred tons of mail matter are daily dispatched, and between forty and sixty tons are daily received; while at New York City this quantity is more than doubled. Even figures become interesting when they represent the standard of intelligence and progress, as shown by an increased correspondence and literature. In no branch of the government service, it can be safely said, have the tenets advanced by the advocates of the civil-service reform been so nearly realized as in this bureau of the Post-Office Department even at that period when the initiatory steps now being applied to other departmental machinery were considered all but Utopian,--a system consisting of a probationary period preceding appointment, and promotion from grade to grade, based upon a practical and thorough system of examination, had long since been developed up through an experimental stage to a well-grounded success. The complexity of the postal system, continually varying in detail, demanded a uniform system of giving information, and a corresponding test of its operation. The system of distribution for each State is compiled in tabulated form in a book or sheet, known as a "scheme," for ready reference when on duty, or study when off the road. In thickly-settled States, where numerous railroads cross and re-cross each other in the same county, it is necessary to have the names of the post-offices arranged