On looking back over long periods of time, the sequence of causes may be followed which have led to this result. First, inventions from the East facilitated trade; then, the perfection of weapons of attack made police possible, and individual bravery unnecessary; on this followed the abasement of the martial and exaltation of the economic type; and finally that intense acceleration of movement by machinery supervened, which, in annihilating space, has destroyed the protection that the costly races long enjoyed against the competition of simpler organisms. Roman civilization was less complex than modern because of the relative inflexibility of the Latin mind. Unable to quicken his motions by inventions, the ancient Italian failed to discover America or absorb India, and, for the same reason, collapsed without an effort under the insidious attack of Asiatic and African labour. No industrial expansion followed the influx of bullion under Cæsar, and therefore, when the value of cereals fell, the evicted farmer either sank into slavery or begged for bread from the magnates of the Senate. In modern times an industrial period has intervened; the evicted long found employment in the factories of the towns, and it has only been as contraction has reduced the demand for merchandise, by diminishing the purchasing power of the agricultural population, that those stagnant pools of the unemployed have collected, which exactly correspond to the proletariat. But, as each special faculty which, for a time, enables its possessor to excel in competition, seems to bear with it the seeds of its own decay, so the inventive, which once enabled the Western races to undersell the Eastern in their homes seems destined to reduce all to a common economic level, as Rome sank to the level of Egypt.