or a truck than it does to polish a pair of shoes. Then there were the trimming-shops, where tops, curtains, boots, and cushions were turned out by the thousand; the supply depots, whose huge steel and concrete buildings were stacked to the ceilings with incredible quantities of tires, tubes, lamps, and other accessories; the repair-shops, with their forges, lathes, and travelling cranes; and the spare-parts department, where, thanks to a remarkably ingenious card-index system, there could be obtained without confusion or delay any duplicate part that might be called for, whether it was a new rear axle for a mobile repair-shop or a tiny cotter-pin for a motorcycle. Though these great shops had been in operation only a few months when the war ended, and though their personnel had been obtained anywhere, everywhere, almost at a moment’s notice, they were probably, everything considered, the best organized and most efficient plants of their kind in the world. The Motor Transport Corps naturally resolves itself into two main branches: Park Service and Field Service. The first of these branches is subdivided, in turn, into four general types of parks: Reception, Organization, Replacement, and Repair. The Reception Park was usually established at, or near, a base port for the purpose of receiving motor vehicles for shipment abroad. Here the vehicles were uncrated, assembled, registered, and put in running condition. This done, the vehicle was sent on to an Organization Park, where vehicles and men first met, the latter coming from one of the Motor Transport Corps schools; here the various units were organized, and the personnel and material held in readiness for assignment. The function of a Replacement Park is, as its name signifies, to fill any deficiencies in equipment or personnel. Though this scheme of organization was quite generally adhered to in the A. E. F., each camp in the United States devoted to motor-transport activities may be said to have combined the functions of Reception, Organization, and Replacement Parks under a single head. [Illustration: MOBILE MACHINE-SHOP OPERATING IN A VILLAGE UNDER SHELL FIRE. _Photograph by Signal Corps, U. S. A._] [Illustration: SUPPLY OF MOTOR TIRES. _Photograph by Signal Corps, U. S. A._] [Illustration: A MOTOR-CAR WRECKED RETURNING FROM THE FRONT LINES. This means a job for the wrecking crew. _Photograph by Signal Corps, U. S. A._]