The materialistic conception of history, as it is called, is due to Marx, and underlies the whole Communist philosophy. I do not mean, of course, that a man could not be a Communist without accepting it, but that in fact it is accepted by the Communist Party, and that it profoundly influences their views as to politics and tactics. The name does not convey at all accurately what is meant by the theory. It means that all the mass-phenomena of history are determined by economic motives. This view has no essential connection with materialism in the philosophic sense. Materialism in the philosophic sense may be defined as the theory that all apparently mental occurrences either are really physical, or at any rate have purely physical causes. Materialism in this sense also was preached by Marx, and is accepted by all orthodox Marxians. The arguments for and against it are long and complicated,
