304 THE DISCOVERY OF THE CHILD Let O stand for the ear; L for the group of motor organs used for the words which make up language; £7 for the auditory centre FIG. 1 of speech; and M for the motor centre. The paths 0U"and ML are peripheral, the first centripetal and the second centrifugal; the path UM is an intercentral connecting tract. The centre U9 in which are formed the auditory images of words, may be subdivided into three, as indicated in the figure 2. FIG. 2 Sounds are realized at Su9 syllables at Si, and words at P. That separate centres for sounds and syllables may be formed is confirmed by the pathology of language, in which in certain forms of centrosensory partial failure of speech the patients can no longer pronounce anything more than sounds, or sounds and syllables. Small children are at first particularly sensitive to the simple sounds of language with which, especially with S, the mother fondles and calls for their attention, whilst later on the child is sensitive to syllables, with which also his mother caresses him, saying, " ba, ba, puf, tuf". Finally, the simple word which attracts the attention of the child is generally a dissyllable.