revenue to maintain himself, he must necessarily be maintained by the public. But in a country of which a great part of the inhabitants are artificers and manufacturers, a great part of the people who go to war must be drawn from those classes, and must therefore be maintained by the public as long as they are employed in its service.

When the art of war, too, has gradually grown up to be a very intricate and complicated science, when the event of war ceases to be determined, as in the first ages of society, by a single irregular skirmish or battle, but when the contest is generally spun out through several different campaigns, each of which lasts during the greater part of the year, it becomes universally necessary that the public should maintain those who serve the public in war, at least while they are employed in that service. Whatever in time of peace might be the ordinary occupation of those who go to war, so very tedious and expensive a service would otherwise be far too heavy a burden upon them. After the second Persian war, accordingly, the armies of Athens seem to have been generally composed of mercenary troops, consisting, indeed, partly of citizens, but partly too of foreigners, and all of them equally hired and paid at the expense of the state. From the time of the siege of Veii, the armies of Rome received pay for their service during the time which they remained in the field. Under the feudal governments the military service both of the great lords and of their immediate dependants was, after a certain period, universally exchanged for a payment in money, which was employed to maintain those who served in their stead.

The number of those who can go to war, in proportion to the whole number of the people, is necessarily much smaller in a civilised than in a rude state of society. In a civilised society, as the soldiers are maintained altogether by the labour of those who are not soldiers, the number of the former can never exceed what the latter can maintain, over and above maintaining, in a manner suitable to their respective stations, both themselves and the other officers of government and law whom they are obliged to maintain. In the little agrarian states of ancient Greece, a fourth or a fifth part of the whole body of the people considered themselves as soldiers, and would sometimes, it is said, take a field. Among the civilised nations of modern Europe, it is commonly computed that not more than one-hundredth part of the inhabitants in any country can be employed as soldiers without ruin to the country which pays the expenses of their service.

The expense of preparing the army for the field seems not to have become considerable in any nation till long after that of maintaining it in the field had devolved entirely upon the sovereign or commonwealth. In all the different republics of ancient Greece, to learn his military exercises was a necessary part of education imposed by the state upon every free citizen. In every city there seems to have been a public field, in which, under the protection of the public magistrate, the young people were taught their different exercises by different masters. In this very simple institution consisted the whole expense which any Grecian state seems ever to have been at in preparing its citizens for war. In ancient Rome the exercises of the Campus Martius answered the same purpose with those of the Gymnasium in ancient Greece. Under the feudal governments, the many public ordinances that the citizens of every district should practise archery as well as several other military exercises were intended for promoting the same purpose, but do not seem to have promoted it so well. Either from want of interest in the officers entrusted with the execution of those ordinances, or from some other cause, they appear to have been universally neglected; and in the progress of all those governments, military exercises seem to have gone gradually into disuse among the great body of the people.

In the republics of ancient Greece and Rome, during the whole period of their existence, and under the feudal governments for a considerable time after their first establishment, the trade of a soldier was not a separate, distinct trade, which constituted the sole or principal occupation of a particular class of citizens. Every subject of the state, whatever might be the ordinary trade or occupation by which he gained his livelihood, considered himself, upon all ordinary occasions, as fit likewise to exercise the trade of a soldier, and upon many extraordinary occasions as bound to exercise it.

The art of war, however, as it is certainly the noblest of all arts, so in the progress of improvement it necessarily becomes one of the most complicated among them. The state of the mechanical, as well as