The gain by the present method is incomparable. Intersecting at Albany, New York, with the line from Vanceborough, Maine, to San Francisco, just described, or perhaps what may be called the vertebral column of the system, is the New York and Chicago railway post-office line, known also as the "Fast Mail" or the "White Mail," as the mail-cars on this line were originally painted white. A mail-train consisting of four mail-cars and express-cars leaves New York City at 8.50 P.M., making the through connection to Chicago. There are two similar trains, leaving New York at 4.35 A.M., and at 10.30 A.M., with a less number of cars; and three moving in the opposite direction. There are twenty mail-cars on this line, each interior is sixty feet in length, and the exterior, as already mentioned, painted white, and bearing the coat-of-arms of some State and the name of its past or present governor. Each car is devoted to a special purpose: the distribution of letters and local, or "way," work; the distribution of paper mail; and others for storage. The distributing cars are built upon a different plan from the one hereinbefore described; the packages, etc., are distributed into large compartments or boxes slightly pitching back one over the other in a large case, and the clerk wishing to empty one of them passes into the narrow aisle to the rear of the case; the pouch or sack is hooked to the case under the door of the box, and the mail drops into it. Pouches and sacks are also hung in racks to be distributed into. These cars are post-offices of no mean pretensions when the amount of work performed is considered. When it is considered how densely populated the country is through which this line passes many times each day, and its numerous and swelling tributaries, the volume of mail conveyed is enormous, yet not disproportionate. The average amount conveyed during thirty days, in the sixty days in January and February of 1881, that the weights of mails were taken between New York City and Buffalo, a distance of four hundred and forty-two miles, amounted to 4,416,451 lbs.; between Buffalo and Chicago, a distance of five hundred and forty-two miles, 2,874,918 lbs. Over the first section 73,607 lbs. per day, the second section 47,848 per day; while either of these amounts does not equal those carried during the same period between New York and West Philadelphia, on the route to Washington, a distance of ninety miles, amounting to 6,202,370 lbs. for the thirty days, and 103,372 lbs. per day, the great discrepancy in miles must be borne in mind and the fact that government supplies and public documents to the East and North contribute no small proportion of the amount. The mail between New York and Chicago is altogether a working mail. It requires more than two hundred and sixty clerks to handle this mail, who travel annually 2,030,687 miles.