Just as movements may thus be used instinctively, that is, without aid from others’ example, both as expressing simple feelings and desires, and also, as in the case just mentioned, as indicating ideas, so spontaneously formed sounds may be used as signs. As pointed out above the first self-prompted articulation is closely connected with feeling, and we find that in the second half-year when the preliminary practice has been gone through certain sounds take on a distinctly expressive function. Thus one little boy when eight months old habitually used the sound ‘ma-ma’ when miserable, and ‘da-da’ when pleased. Among these instinctive expressive sounds one of the most important is that indicative of hunger. I find again and again that a special sound is marked off as a mode of expression or sign of this craving. This fact will be referred to again presently. True language-sounds significant of things grow out of this spontaneous expressive articulation. Thus the demonstrative sign _da_ which accompanies the pointing, and which seems to be frequently used with slight modifications by German as well as by English children, is probably in its inception merely an interjectional expression of the faint shock of wonder produced by the appearance in the visual field of a new object. But used as a concomitant of the pointing gesture it takes on a demonstrative or indicative function, announcing the presence or arrival of an object in a particular locality or direction. A somewhat similar case is that of ‘ata’ or ‘tata,’ a sign used to denote the departure or disappearance of an object. These signs are, as Preyer shows, spontaneous and not imitative (_e.g._, of ‘there’ (da), ‘all gone’). This is confirmed by the fact that they vary greatly. Thus Preyer’s boy used for “there” ‘da,’ ‘nda,’ ‘nta,’ etc., and for “all gone” ‘atta,’ ‘f-tu,’ ‘tuff,’ etc. Again, Tiedemann’s boy used the sound ‘ah-ah,’ and one of Stanley Hall’s children the sound ‘eh,’ when pointing to an object. We may conclude then that there are spontaneous vocal reactions expressive of the contrasting mental states answering to the appearance or arrival and the disappearance or departure of an impressive and interesting object, and that, further, these reactions when recognised by others tend to become fixed as linguistic signs.[64] ----- Footnote 64: See Preyer, _op. cit._, pp. 353, 390, 391. -----