This is Volume X in a series of twenty-one in a collection on Cognitive Psychology. Originally published in 1931, in this book, M. Montmasson is concerned to demonstrate a fact of the first importance, easily overlooked. The fact is this, that human inventions in the widest sense of the word, are products of the unconscious.

This is Volume X in a series of twenty-one in a collection on Cognitive Psychology. Originally published in 1931, in this book, M. Montmasson is concerned to demonstrate a fact of the first importance, easily overlooked. The fact is this, that human inventions in the widest sense of the word, are products of the unconscious.