Besides these moral hindrances, mechanical difficulties are often an insuperable impediment to forms of government. In the ancient world, though there might be, and often was, great individual or local independence, there could be nothing like a regulated popular government beyond the bounds of a single city-community; because there did not exist the physical conditions for the formation and propagation of a public opinion, except among those who could be brought together to discuss public matters in the same agora. This obstacle is generally thought to have ceased by the adoption of the representative system. But to surmount it completely, required the press, and even the newspaper press, the real equivalent, though not in all respects an adequate one, of the Pnyx and the Forum. There have been states of society in which even a monarchy of any great territorial extent could not subsist, but unavoidably broke up into petty principalities, either mutually independent, or held together by a loose tie like the feudal: because the machinery of authority was not perfect enough to carry orders into effect at a great distance from the person of the ruler. He depended mainly upon voluntary fidelity for the obedience even of his army, nor did there exist the means of making the people pay an amount of taxes sufficient for keeping up the force necessary to compel obedience throughout a large territory. In these and all similar cases, it must be understood that the amount of the hindrance may be either greater or less. It may be so great as to make the form of government work very ill, without absolutely precluding its existence, or hindering it from being practically preferable to any other which can be had. This last question mainly depends upon a consideration which we have not yet arrived at--the tendencies of different forms of government to promote Progress.