RÉVÉSZ, G.—_Nyviegyhazi: Psychologische Analyse eines musikalisch hervorragenden Kindes_; Veit u. Co., Leipzig, 1916. RICHET, C.—“Note sur un remarquable précocité musicale”; _Congrès Internationale de Psychologie_, 1901. RUPP, H.—“Ueber die Prüfung musikalischer Fähigkeiten”; _Zeitschrift für angewandte Psychologie_, 1914. SCHUSSLER, H.—“Das unmusikalische Kind”; _Zeitschrift für angewandte Psychologie_, 1916. SEASHORE, C. E.—_The Psychology of Musical Talent_; Silver, Burdett and Co., New York, 1919. STANTON, H. M.—“The Inheritance of Special Musical Capacities”; _University of Iowa Studies, 8. Psychological Monographs_, 1922. CHAPTER IX MISCELLANEOUS I. SPECIAL FUNCTIONS WHICH HAVE NOT BEEN LONG STUDIED There are various mental functions which are now thought to be largely special, which have not yet been studied sufficiently to warrant extended discussion of each, yet which merit notice as such if for no other reason than that attention should be directed to the desirability of studying their place in intellectual organization. Some of these, like chess-playing, will not be discussed here, as they are at present but remotely connected with prescribed education. We shall, therefore, comment upon but some of these, giving such facts and theories as are available in the case of each. II. LEFT-HANDEDNESS The hand is rated by students of the history of civilization as one of the most important determinants of man’s rise from savagery. The loss of even a finger is a handicap recognized in such times of stress, as when men are drafted for war. With the great majority of people, the two hands are unequal in strength and accuracy, the right being the major member. With a small minority of children there is, however, a predisposition to use the left hand, instead of the right hand, as the major member. This is a special condition which must be taken into account by educators. According to different investigators, the proportion of left-handed children ranges from 2 to 6 per cent. The disagreements arise from the variety of criteria used and of populations sampled. The median figure of 4 per cent seems, for several reasons most probable, as the general proportion of left-handedness.