When there are several vessels laden with artillery and stores for the expedition, each vessel should have on each quarter and on a single masthead a number that can be easily distinguished at a distance. The same number should be entered on the list of supplies shipped in each vessel. The commander can then know exactly what resources he has with him. Some vessels, distinguished by particular signal, should be laden solely with such powder and ammunition as may not be required for immediate service of the pieces. If it is necessary to reship or leave any articles on board the vessels, care should be taken to note them on the list. Boats of proper capacity must be provided for the disembarkation, according to the circumstances in each case. It may be necessary to establish temporary wharves on trestles, or to erect shears, cranes, or derricks. RAILROAD TRANSPORTATION. The most suitable car for carrying horses, especially in warm weather, is the "slat stock-car," built of slats and open all around, but tight in roof. Another kind, known as the "combination car," is made with five doors on each side and one at each end, which may be closed tight for stores, or with iron grates when carrying horses. These are suitable for either warm or cold weather. Both kinds are usually from 28 to 30 feet long, 7 feet 9 inches wide, and 6 feet 8 inches high, inside measurement. Each car will carry 16 artillery or 18 common horses or mules. Be careful to have floors sanded to keep horses from slipping down. Loading cars with horses at night should be avoided. The battery should be drawn up in the most convenient position for loading; and during the operation of loading quiet and order must be maintained. Dismount; let the men fall out of ranks if necessary and then reform, and have personal equipment, etc., placed on the ground; unhitch; unharness and tell off the horses to the cars, cannoneers assisting drivers. Station a non-commissioned officer and one private at the door; the former to superintend the work and the latter to count in a loud tone the horses as they enter. Two more privates should be present to assist in putting horses in position, etc. After horses are loaded all assist in loading the material. The battery is then reformed, retake equipments, etc., and the men are told off to cars.