That the vessels anchored in the base should be protected from the fire of ships at sea and from guns on neighboring shores is clear. Therefore, even if a base be hidden from the sea and far from it as is the harbor of Santiago, it must be protected by guns, or mines, or both; the guns being nearer to the enemy than are the ships in the waters of the base. An island having high bluffs, where large guns can be installed, and approached by gradually shoaling waters in which mines can be anchored, with deeper water outside in which submarines can operate, is desirable from this point of view. Ability to store and protect large quantities of provisions is essential, and especially in the case of ammunition and high explosives. For storing the latter, a hilly terrain has advantages, since tunnels can be run horizontally into hills, where explosives can lie safe from attack, even attack from aircraft dropping bombs above them. Naturally, the country that has led the world in the matter of naval bases is Great Britain; and the world at large has hardly yet risen to a realization of the enduring work that she has been quietly doing for two hundred years, in establishing and fortifying commodious resting-places for her war-ships and merchant ships in all the seas. While other nations have been devoting themselves to arranging and developing the interiors of their countries, Great Britain has searched all the oceans, has explored all the coasts, has established colonies and trading stations everywhere, and formed a network of intimate commercial relations which covers the world and radiates from London. To protect her commercial stations and her merchant ships from unfair dealings in time of peace, and from capture in time of war, and to threaten all rivals with defeat should they resort to war, Great Britain has built up the greatest navy in the world. And as this navy pervades the world, and as her merchant ships dot every sea and display Great Britain's ensign in every port, Great Britain has not failed to provide for their safety and support a series of naval stations that belt the globe. Bases are of many kinds, and may be divided into many classes. An evident ground for division is that of locality in relation to the home country. Looked at from this point of view, we may divide naval bases into two classes, home bases and distant bases. _Home Bases_.--A home base is, as its name implies, a base situated in the home country. The most usual type of the home naval base is the navy-yard, though few navy-yards can meet all the requirements of a naval base. The New York navy-yard, for instance, which is our most important yard, lacks three of the most vital attributes of a naval base, in that it has no means for receiving and protecting a large fleet, it cannot be approached by large ships except at high tide, and it could not receive a seriously injured battleship at any time, because the channel leading to it is too shallow.