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A final fact adduced against the theory that it is impossible to think without language, which was very popular, is that deaf and dumb people cannot speak, and yet can think; this argument has no great value, as it is now averred that “a man born dumb who had always lived among deaf and dumb people, and had not been taught to express thoughts by signs would be capable of few higher intellectual manifestations than a monkey or an elephant; and this in spite of the fact that no naturalist could distinguish any difference between the size of their brains and those belonging to men who could speak.” For deaf mutes to be able to think and reason, they must have learned from those who use words, then only can they substitute other signs for their words and concepts. Still Professor Huxley accords to these unfortunate men certain intellectual heritages derived from their parents.

These are some of the chief points in the science of language. The fundamental law which this science lays down of the unity of thought and speech is a torch which may throw light on the origin of man.