Both purchase and requisition demand good organization, and trained supply officers accompanying the troops. The Supply Service is organized in the way about to be described, partly so as to provide officers, men, and wagons to collect supplies in the country and bring them to the troops, partly to transport from the Base what is required to supplement the amount collected. The Supplies for an Army in the Field may be considered under two heads: (I.) _Mobile Supplies with the Troops._ (II.) _Supply Depôts on the Lines of Communication._ (I.) MOBILE SUPPLIES WITH THE TROOPS The former are divided into three lines of supply: (_a_) Regimental Supplies, controlled by the Unit itself. (_b_) Column Supplies. (_c_) Park Supplies. The last two are controlled by the Supply Service. (_a_) _Regimental Supplies_ are those carried in Regimental wagons, in addition to what is in the personal charge of each man--namely, the remains of the current day’s ration issued overnight, and an emergency ration of preserved food. In the wagon with each unit are one day’s ration of food and of oats for the unit, for issue that evening, besides a second grocery ration and some compressed forage. (_b_) _Column Supplies_ are carried in Supply Columns, of which one is allotted to each Division and Mounted Brigade, and to the Army Troops. Each Column carries one day’s ration and forage for its Division, and one emergency ration. One day’s meat on the hoof will usually be driven with the Column. The Supply Column replenishes the regimental supplies daily, and is kept filled up by collecting local supplies, or by drawing on the L. of C. depôts, or, as a last resource, on the Park Supplies. (_c_) _Park Supplies_ are carried in the Transport and Supply Park allotted to each Division, which usually marches a day’s march in rear of the troops. It carries three days’ rations for its Division, and is divided into three sections, _i.e._ 1 per Brigade. There is in the Field Park also a Bakery Detachment, capable of baking for 22,500 men; this is, as a rule, stationed at the Advanced Base. One to three days’ meat supply on the hoof will generally be driven with the Park. The Parks are kept filled up by a more extended exploitation of local resources than the Supply Columns can effect, and obtain the balance required from the L. of C. depôts. This organization thus supplies the following rations per man, and corn per horse, with the troops in the field, apart from any Supplies which may be moving up along the L. of C. COMPOSITION OF FIELD RATION Meat: 1¼ lb. fresh, or 1 lb. preserved. Bread: 1¼ lb., or 1 lb. biscuit. Groceries: Tea, sugar, salt, pepper. Jam. Lime-juice and rum, when authorized. Vegetables: 8 oz. fresh, or 2 oz. dried, or 4 oz. preserved fruit. The weight of a ration may be taken at 3 lb. net or 4 lb. gross, and that of the emergency ration is 6½ lb. net or 9½ lb. gross.