In neglecting or minimizing the great factor of sex in human society, the Marxian doctrine reveals itself as no stronger than orthodox economics in guiding our way to a sound civilization. It works within the same intellectual limitations. Much as we are indebted to the Marxians for pointing out the injustice of modern industrialism, we should never close our eyes to the obvious limitations of their own "economic interpretation of history." While we must recognize the great historical value of Marx, it is now evident that his vision of the "class struggle," of the bitter irreconcilable warfare between the capitalist and working classes was based not upon historical analysis, but upon on unconscious dramatization of a superficial aspect of capitalistic regime. In emphasizing the conflict between the classes, Marx failed to recognize the deeper unity of the proletariat and the capitalist. Nineteenth century capitalism had in reality engendered and cultivated the very type of working class best suited to its own purpose--an inert, docile, irresponsible and submissive class, progressively incapable of effective and aggressive organization. Like the economists of the Manchester school, Marx failed to recognize the interplay of human instincts in the world of industry. All the virtues were embodied in the beloved proletariat; all the villainies in the capitalists. The greatest asset of the capitalism of that age was, as a matter of fact, the uncontrolled breeding among the laboring classes. The intelligent and self-conscious section of the workers was forced to bear the burden of the unemployed and the poverty-stricken. Marx was fully aware of the consequences of this condition of things, but shut his eyes tightly to the cause. He pointed out that capitalistic power was dependent upon "the reserve army of labor," surplus labor, and a wide margin of unemployment. He practically admitted that over-population was the inevitable soil of predatory capitalism. But he disregarded the most obvious consequence of that admission. It was all very dramatic and grandiloquent to tell the workingmen of the world to unite, that they had "nothing but their chains to lose and the world to gain." Cohesion of any sort, united and voluntary organization, as events have proved, is impossible in populations bereft of intelligence, self-discipline and even the material necessities of life, and cheated by their desires and ignorance into unrestrained and uncontrolled fertility.