The total result of the foregoing observations concerning the capacity of accomplishment on the part of uneducated deaf-mutes in regard to the natural language of gesture and feature, demonstrates more plainly than any other fact whatever that, without words and without signs for words, thought-activity exists--that thinking takes place when both words and signs for words are wanting. Wherefore, then, should the logical combination of ideas in the human being born perfect begin only with the speaking of words or the learning to speak? Because the adult supposes that he no longer thinks without words, he easily draws the erroneous conclusion that no one, that not even he himself, could think before the knowledge of verbal language. In truth, however, it was _not language that generated the intellect; it is the intellect that formerly invented language: and even now the new-born human being brings with him into the world far more intellect than talent for language_. FOOTNOTES: [C] Empfindungsvorstellungen. CHAPTER XVII. LEARNING TO SPEAK. No human being remembers how he learned his mother-tongue in early youth, and the whole human race has forgotten the origin of its articulate speech as well as of its gestures; but every individual passes perceptibly through the stage of learning to speak, so that a patient observer recognizes much as conformable to law. The acquisition of speech belongs to those physiological problems which can not be solved by the most important means possessed by physiology, vivisection. And the speechless condition in which every human being is born can not be regarded as a disease that may be healed by instruction, as is the case with certain forms of acquired aphasia. A set of other accomplishments, such as swimming, riding, fencing, piano-playing, the acquirement of which is physiological, are learned like articulate speech, and nobody calls the person that can not swim an anomaly on that account. The _inability to appropriate_ to one's self these and other co-ordinated muscular movements, this alone is abnormal. But we can not tell in advance in the case of any new-born child whether he will learn to speak or not, just as in the case of one who has suffered an obstruction of speech or has entirely lost speech, it is not certain whether he will ever recover it. In this the normal child that does _not yet_ speak perfectly, resembles the diseased adult who, for any cause, _no longer_ has command of language. And to compare these two with each other is the more important, as at present no other empirical way is open to us for investigating the nature of the process of learning to speak; but this way conducts us, fortunately, through pathology, to solid, important physiological conclusions. 1. Disturbances of Speech in Adults.