As regards intellectual work it remains a fact, indeed, that great decisions in the realm of thought and momentous discoveries and solutions of problems are only possible to an individual, working in solitude. But even the group mind is capable of genius in intellectual creation, as is shown above all by language itself, as well as by folk-song, folk-lore and the like. It remains an open question, moreover, how much the individual thinker or writer owes to the stimulation of the group in which he lives, or whether he does more than perfect a mental work in which the others have had a
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