The net is now lowered for the receipt at Harrow. In a second or two, a tremendous thud is heard, and a large pouch comes crashing into the carriage through the aperture, the men meanwhile keeping a respectful distance. I should perhaps explain that in the Special Mail a new form of net is used. The bottom of it is flush with the carriage floor, and as the lower portion is constructed with an angle of about forty-five degrees, the pouches roll into the carriage by their own weight. We will now see what the pouch from Harrow contains. It is quickly unstrapped; the bags are taken out; and it is then laid aside, to be used for despatch at a subsequent station. There are three bags for the Travelling Post-office received in this pouch--two containing correspondence for England and Scotland, and one for Ireland. The bags are immediately opened by the proper officers. The first duty is to find the letter-bill; and if there are any registered letters, to compare them with the entries on the bill, when, if correct, the bill is signed and passed over, together with the registered letters, to the officer who disposes of that class of correspondence, and by whom an acknowledgment of the receipt of the letters is at once given to the bag-opener. It is in this way that a hand-to-hand check is established which ensures the practical safety of such letters. The bag-opener then proceeds to pick out from amongst the mass of correspondence the bundles of ordinary letters, and to pass them to the right or left according as they are labelled No. 1 or No. 2. These bundles are cut open by the respective sorters who work at the several sets of boxes, the letters being laid in a row on the desk, and the men then proceed to sort them in accordance with the addresses they bear. As the boxes (each of which will hold about one hundred and fifty) become full, the letters are tied up securely in bundles, and the sorters, turning round, drop them into the bags which hang along the other side of the carriage. And so the work goes on in the same way throughout the entire journey.