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THEORIES ON THE ORIGIN OF SPEECH The evolutionary theory is thus propounded by Romanes in his "Mental Evolution in Man," pp. 377-399: "Starting from the highly intelligent and social species of anthropoid ape as pictured by Darwin, we can imagine that this animal was accustomed to use its voice freely for the expression of the emotions, uttering danger signals, and singing. Possibly it may also have been sufficiently intelligent to use a few... more...