Such a method has been found in the tonoscope, an instrument which registers visually every pitch movement of vocal chords, or other sounding body. Practicing with the tonoscope, the musician can see what his errors are, and learn what motor reaction will bring correction. The control of the eye is thus introduced into practice, as it is in tennis, writing, or other form of precise motor learning. Singers of all degrees of talent show improvement in pitch after practice with this instrument, and the improvement continues after the instrument has been laid aside. The gain made with the help of the eye remains in motor control, just as once having learned to write by aid of the eye, we can easily write in the dark or with eyes closed. The susceptibility to improvement in other forms of musical action has not been shown experimentally, this whole field being practically unstudied as yet by experimental method. X. THE INHERITANCE OF MUSICAL TALENT The inheritance of musical talent has been investigated by Copp and by Stanton. The latter has made measurements of specific musical capacities in relatives of musicians, using Seashore’s tests. This is the beginning of adequate study of the inheritance of musical talent, as the method, though laborious, is correct. Four of the Seashore measures of musical talent were given to eighty-five members of six unrelated family groups, starting in each group with a person conspicuously known as a musician. These measurements were supplemented by a set questionnaire, covering musical endowment, musical education and training, musical activity, musical appreciation, musical memory and imagination, the questionnaire including a larger number of relatives. From these data, a study was made of the tendency of offspring to be musical or unmusical, in accordance with parentage and more remote ancestry. The results show that musical talent is inherited, and the investigator believes it not improbable that the formula of inheritance may be Mendelian. Much wider research would, however, be avowedly necessary, in order to establish the formula. It may or may not be Mendelian. The offspring of a mating of musical with unmusical, of musical with musical, or of unmusical with unmusical, may thus inherit from either parent or from both parents, and apparently without regard to sex. Sex differences do not appear, either, in any of the tests of musical sensitivity, which have been standardized. XI. PSYCHOGRAPHIC STUDY OF INDIVIDUALS In order to illustrate concretely the way in which musical talent may or may not accompany other mental capacities, a few psychographic studies of individuals are presented, as follows. The first is the psychograph of a girl, whom we may call G, aged 14 years. It shows her status in percentile ratings, on various mental and motor tests. G is of average, or typical, general intelligence, with superior rating in musical capacity, and in drawing.