The power of a navy is of recent growth, but it is increasing and is going to continue to increase. Every advance of civilization will advance the navy. Every new discovery and invention will directly or indirectly serve it. The navy, more than any other thing, will give opportunity for mechanism and to mechanism. Far beyond any possible imagination of to-day, it will become the highest expression of the Genius of Mechanism, and the embodiment of its spirit. The amount of money now being spent by the United States on its navy is so great that the expenditure can be justified only on the basis that great naval power is essential to the country. Is it essential, and if so, why? _Primary Use for a Navy_.--To answer this wisely, it may be well to remind ourselves that the principal object of all the vocations of men is directly or indirectly the acquiring of money. Money, of course, is not wealth; but it is a thing which can be so easily exchanged for wealth, that it is the thing which most people work for. Of course, at bottom, the most important work is the getting of food out of the ground; but inasmuch as people like to congregate together in cities, the thing taken out of the ground in one place must be transported to other places; and inasmuch as every person wants every kind of thing that he can get, a tremendous system of interchange, through the medium of money, has been brought about, which is called "trade." For the protection of property and life, and in order that trade may exist at all, an enormous amount of human machinery is employed which we call "government." This government is based on innumerable laws, but these laws would be of no avail unless they were carried out; and every nation in the world has found that employment of a great deal of force is necessary in order that they shall be carried out. This force is mainly exercised by the police of the cities; but many instances have occurred in the history of every country where the authority of the police has had to be supported by the army of the national government. There is no nation in the world, and there never has been one, in which the enforcement of the necessary laws for the protection of the lives, property, and trade of the people has not depended ultimately on the army; and the reason why the army could enforce the laws was simply the fact that the army had the power to inflict suffering and death. As long as a maritime country carried on trade within its own borders exclusively, as long as it lived within itself, so long as its people did not go to countries oversea, a navy was not necessary. But when a maritime country is not contented to live within its own borders, then a navy becomes essential to guard its people and their possessions on the highways of the sea; to enforce, not municipal or national law, as an army does, but international law.