The greatest light is thrown upon the nature of language by analogy. We have the analogy of the cries of animals, of the songs of birds ('man, like the nightingale, is a singing bird, but is ever binding up thoughts with musical notes'), of music, of children learning to speak, of barbarous nations in which the linguistic instinct is still undecayed, of ourselves learning to think and speak a new language, of the deaf and dumb who have words without sounds, of the various disorders of speech; and we have the after-growth of mythology, which, like language, is an unconscious creation of the
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