We have space but for one illustration from the many which this subject affords; it relates to inventiveness in language imitation. We have already seen that the experimental play of infants (especially in reduplication) furnishes material for a science of language. The easily articulated syllables papa, mamma, baba, fafa, dada, etc., are sufficiently explained in the case of parents, who take them into their own vocabulary and thus confirm the child in their use. Many expressive words have originated in this way.[557] Darwin’s child said “mum” to signify eating or wanting to eat, and Strümpell’s daughter at ten months called all the birds that she saw from the window “tibu.”[558] Older children, too, often indulge in such playful experimental coining of words,[559] as we shall see later. At present we are more concerned with the word building founded on acoustic imitation. Preyer thinks that the only kind of word creation practised by children is the imitation of sounds which they have heard and their repetition in the form of interjections. I quote from him: “When the listener first imitates a word and then makes independent use of it depends with normal children principally on whether much effort is made to instruct them. More important psychogenetically ... are observations on the creation of words with a special sense before the beginning of genuine speech. These are not to be regarded as mistaken, imperfect, or onomatopœic imitations,... but rather as original interjections. In all my observations and studies directed especially to their investigation, I have been able to discover nothing tending to establish a connection of the hearer’s concepts with articulate sounds and syllables.... S. S. Haldemann has in his notes on the invention of words, which include a small boy’s discoveries in that line, citations from Taine, Holden, myself, and others. This boy called a cow “m,” a bell “tin-tin” (Holden’s boy said “ling-dong-mang” for a church bell), a locomotive “tschu-tschu,” the splash of something falling in water “boom,” and applied the same word to throwing, striking, falling, shooting, etc., without regard to the quality of the sound, though always with reference to some sound. In weighing the fact that a sound repeated to him, such as a trumpet call, was fitted with a word suggestive of the sound seems to show that an intelligent child attempts to imitate and repeat what he hears, despite the objection of a Max Müller, and until a better hypothesis is offered affords an object lesson in the study of the origin of language.”