In fact these men were really robbers; being just like any other robbers, excepting that they restricted themselves to some rule and system in their plunderings, such as an enlightened regard for their own interest required. If, when they found a vessel laden with merchandise, or a company of travellers coming down the river, they had robbed them of every thing they possessed, the river and the roads would soon have been entirely abandoned, and their occupation would have been gone. In order to avoid this result, they were accustomed to content themselves with a certain portion of the value which the traveller was carrying; and they called the money which they exacted a tribute, or tax, paid for the privilege of passing through their dominions. They kept continual watch in their lofty castles, both up and down the river, to see who came by, and then, descending with a sufficient force to render resistance useless, they would take what they pretended to consider their due, and retreat with it to their almost inaccessible fastnesses, where they were safe from all pursuers. They often had wars with one another; and in the progress of these wars the weaker chieftains became, in the course of time, subjected to the stronger, and thus two or more small dominions would often become united into one. These amalgamations went on continually; and as they advanced, the condition of the cultivator of the ground, and of the peaceful merchant or traveller, was improved, for the rules and regulations for the collection of the tribute became more fixed and settled, and men knew more and more what they could calculate upon, and could regulate their business accordingly. Arrangements were made, too, to collect a regular tax from the cultivators of the ground; and just so far as these arrangements were matured, and the produce of the plunder, or the tribute, or the tax, or whatever we call it, increased, just so far it became for the interest of the chieftains that the cultivation of the land and the traffic on the river should be increased, and should be protected from all depredations but their own. Thus a system of law grew up, and arrangements for preserving public order, for promoting the general industry, and rules and regulations for the collection of the tribute, until at length, when all these arrangements were matured, and the multitude of petty chieftains became combined under one great chieftain ruling over the whole, and collecting the revenue for his subordinates, we find a great kingdom as the result, in which the descendants of the ancient marauders that lived in castles on the hills, under the name of princes and nobles, collect the means of enabling themselves to live in idleness and luxury out of the avails of the labor of the agriculturists, the merchants, and the manufacturers, by a combined and concerted arrangement, and a regular system of rents, taxes, and tolls, instead of by irregular forrays and depredations, as in former years.