As samples of the observations the following may be taken. A friend tells me his boy when one year old used just 50 vocables. The performances vary greatly. One American girl of twenty-two months had 69, whereas another about the same age had 136, just twice the number. A German girl eighteen months old is said by Preyer to have used 119 words, and to have raised this to 435 in the next six months. The composition of these early vocabularies will occupy us presently. ----- _Logical Side of Children’s Language._ It is now time to pass from the mechanical to the logical side of this early child-language, to the meanings which the small linguist gives to his articulate sounds and the ways in which he modifies these meanings. The growth of a child’s speech means a concurrent progress in the mastery of word-forms and in the acquisition of ideas. In this each of the two factors aids the other, the advance of ideas pushing the child to new uses of sounds, and the growing facility in word-formation reacting powerfully on the ideas, giving them definiteness of outline and fixity of structure. I shall not attempt here to give a complete account of the process, but content myself with touching on one or two of its more interesting aspects. A child acquires the proper use or application of a word by associating the sound heard with the object, situation or action in connexion with which others are observed to use it. But the first imitation of words does not show that the little mind has seized their full and precise meaning. A clear and exact apprehension of meaning comes but slowly, and only as the result of many hard thought-processes, comparisons and discriminations. In these first attempts to use our speech, the child’s mind is innocent of grammatical distinctions. These arise out of the particular uses of words in sentence-structure, and of this structure the child has as yet no inkling. If, then, following a common practice, I speak of a child of twelve or fifteen months as _naming_ an object, the reader must not suppose that I am ascribing to the baby-mind a clear grasp of the function of what grammarians call nouns (substantives). All that is implied in this way of speaking, is that the infant’s first words are used mainly as recognition-signs. There is from the first, I conceive, even in the gesture of pointing and saying ‘da!’ a germ of this naming process.