For cases requiring special ease of movement and quiet the broad, square-built French canal boats make excellent travelling hospitals. Nearly all the rivers of Northern France are canalised, and these waterways are kept up free of toll by the State, so that water transport is almost as available as transport by rail. A photograph shows what roomy wards the ordinary French canal boat provides. The boats in British use are usually towed in pairs by small tugs. During the battle of 1916 the big red crosses on the boats’ sides were to be seen everywhere on the Somme. Red Cross Trains. The equipment of Red Cross trains is more generally known and several improvements have been made in it during the war. With its operating theatre, kitchen, store-room and staff accommodation, a Red Cross train is now a travelling hospital rather than a vehicle plying between one hospital and another. THE ARMY’S PETROL SUPPLY In the early part of the war the petrol needed for the motor transport of the British Expeditionary Force was shipped from England in tins, ready for use. When the growth of the Army made more exacting demands on shipping, it was decided to economise sea transport by making, filling and packing the tins in France. Transplanting a Works. To do this, it was necessary to transplant the existing works from England to France. But it was also necessary not to interrupt the supply; for, without petrol, a modern army would be like a modern nation without coal. So one half of the plant in England was dismantled and re-erected in France, the other half undertaking the whole work of supply until the first half was in working order in France. Then the second half followed across the Channel. The whole migration took twelve weeks. Of course, the Army does not run the risks of having only one base depôt of petrol. At each of its depôts every process is carried out that is needed for the transfer of a gallon of petrol from a tank steamer lying at a port to the divisional lorry or staff car by which it is used. The first thing to do is to make receptacles for its conveyance. At each depôt there is one factory for making tins and another for making the cases or boxes in which the tins are packed. A single depôt employs more than 200 men and boys on these two kinds of work. The photographs will suggest the power and precision of the machinery which they use—one machine for cutting out the tin, another for shaping the cans, a third for rolling the edges on, a fourth for soldering, a fifth for stamping, and so on. A leaky tin is, of course, worse than useless, so every can has to be tested by air. Filling the Tins.