Each description of Ambulance comprises a _Bearer Division_ of stretcher bearers, and a _Tent Division_, which forms a “Dressing Station”--that is, a small mobile field hospital in which only absolutely necessary dressing is applied. The _Field Ambulance_ is divided into three equal Sections, and the _Cavalry Field Ambulance_ into two Sections. Each Section has 3 ambulance wagons, a water cart, and 2 wagons and a cart for carrying its stores, baggage, and supplies. Each Section is thus self-contained, and can be sent off without reorganization, whenever required to accompany a detached portion of the Brigade. The strength of a _Field Ambulance_ is: 10 Officers, 120 stretcher bearers, 60 hospital staff, all belonging to the Royal Army Medical Corps (R.A.M.C.), and 60 men and 90 horses provided by the A.S.C. for its transport, which consists of 10 four-horsed ambulance wagons, 3 water carts, and 9 other wagons for medical supplies, baggage, and stores. Its _Bearer Division_ provides 18 squads of stretcher bearers, each squad being of 6 men; and its _Tent Division_ can accommodate 150 patients. A _Cavalry Field Ambulance_ comprises: 6 Officers, 38 stretcher bearers, 30 hospital staff, of the R.A.M.C., and 44 men and 70 horses of the A.S.C. It has 4 two-horsed, and 6 four-horsed, ambulance wagons, 2 water carts, 4 other wagons. Its _Tent Division_ can accommodate 50 patients. The establishment of a _Clearing_, or a _Stationary_, _Hospital_ to accommodate 200 patients is 8 Officers and 80 other ranks; that of a _General Hospital_, 21 Officers and 140 other ranks. Nursing sisters are allotted to the non-mobile Hospitals on the L. of C. at the rate of 17 to 200 patients, but not to the mobile Clearing Hospitals. Each Ambulance Train is provided with 2 Officers, 18 other ranks, and 2 sisters, and can carry 100 patients. THE SANITARY SERVICE The Sanitary Service is one of the Medical Services. Its object is to preserve the health of the troops, by looking after purity of water supply, and sanitation of camps. The personnel of the Sanitary Service is provided by the R.A.M.C. It comprises a _Sanitary Squad_ with each Unit, and on the Lines of Communication a _Sanitary Section_ at the Base and Railhead, a Squad at each Post or Rest Camp, and 2 Squads at each Advanced Base. The _Section_ comprises an Officer and 25 men of the R.A.M.C., the _Squad_ a Sergeant and 5 men. In addition, a N.C.O. of each Cavalry Regiment, or Artillery Brigade, or Battalion, and 1 or 2 men of each Squadron, Battery, or Company, are trained for carrying out Sanitary duties with their Unit. CHAPTER X THE EXPEDITIONARY FORCE (_continued_) SERVICES ON THE LINES OF COMMUNICATION 5. THE VETERINARY SERVICE The efficiency of the Veterinary Service is of great importance to prevent waste of horseflesh.