New discoveries in physics (including x-rays, electrons, and the beginnings of quantum mechanics) challenged previous conceptions of matter and materialism. Matter seemed to be disappearing. Lenin disagreed:
'Matter disappears' means that the limit within which we have hitherto known matter disappears and that our knowledge is penetrating deeper; properties of matter are disappearing that formerly seemed absolute, immutable and primary, and which are now revealed to be relative and characteristic only of certain states of matter. For the sole 'property' of matter with whose recognition philosophical materialism is bound up is the property of being an objective reality, of existing outside of the mind.
Lenin was following on from the work of Engels, who had noted that "with each epoch-making discovery even in the sphere of natural science, materialism has to change its form." (Ludwig Feuerbach and the End of Classical German Philosophy.) One of Lenin's challenges was distancing materialism as a viable philosophical outlook from what he referred to as the "vulgar materialism" expressed in statements like "the brain secretes thought in the same way as the liver secretes bile" (attributed to 18th century physician Pierre Jean Georges Cabanis, 1757-1808); "metaphysical materialism" (matter is composed of immutable, unchanging particles); and 19th-century "mechanical materialism" (matter was like little molecular billiard balls interacting according to simple laws of mechanics). Lenin's (and Engels') solution to this challenge was "dialectical materialism", where matter was understood in the broader sense of "objective reality" and consistent with new developments in science.
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