A group occupying a position midway between the foregoing and that which is now to be treated of consists of such imitations as find their antecedent in movement which appeals to the eye and yet whose real effect is in the repetition of acoustic impressions. Preyer records the following unsuccessful effort at the end of the first year: “At this period, if any one struck with a salt spoon on a glass, making it sound, my child would take up the spoon and attempt to hit the glass in the same way, but he could not get the tone.”[552] Quite similar is Baldwin’s observation: “H——’s first clear imitation was on May 24th (beginning of ninth month) in knocking a bunch of keys against a vase as she saw me do it, in order to produce the bell-like sound. This she repeated over and over again, and tried to reproduce it a week later when, from lapse of time, she had partly forgotten how to use the keys.”[553] This sort of imitation, where, as in putting out the light, the result is more important than the movement itself, is more enduring than simple movement imitation, because the end attained is itself a source of pleasure. The most important phase of acoustic imitation is that which aids in the child’s acquirement of speech. In studying experimentation we found that voice practice is an indispensable antecedent of learning to talk. Add to this the imitative impulse and the equipment is complete for acquiring a mother tongue. The child imitates all the kinds of sound that he hears—the howling of the wind, animal calls, coughing and sneezing—but of course he hears most constantly the sounds of his native language, and so it naturally follows that he gives it particular attention, which constantly increases as he becomes aware of his parents’ delight in his acquirements and as he perceives their practical use.