The Roman constitution had lost none of its complexity by growth. The accretions of ages had changed a curious but comparatively simple type of polity into a jumble of constitutional law and custom, through which even the keen eye of the Roman jurist could not pierce, and which even his capacity for fictitious interpretation and the invention of compromises could not reduce to a system. The lack of logic, which is the usual accompaniment of a conservatism not thorough-going enough to be consistent, produced a machine the results of which appeared for a time to be eminently satisfactory. It conquered the world, and succeeded for a time in governing it with some show of decency and a fair measure of success. Had the equilibrium been maintained in practice as in theory, mixed constitutions would have had the most assured claim to the respect and acceptance of the world. But as the knots which the jurist could not untie were cut by the sword, and the constitution reverted to a type far simpler even than that of its origin, we must assume a weakness in the mixed system, which might not have rendered it inadequate as the government of a city state or even of Italy, but certainly rendered it incapable of imperial rule. The test was a severe one, and the constitution which could not answer the strain need not be wholly condemned. For empire is a mere excrescence on the life of a state, a test neither of its goodness nor of its vitality. A pure treatment of the Roman constitution will neglect, as far as possible, this abnormal growth, and, although much of its structure was the result of war,[595] will be able to show that its essential peculiarities were not the effect of conquest.