168 SECTIONAL ADDRESSES 
Netson, H.,‘ The creative years,’ Amer. J. Psychol., 40, 1928. 
ScHorn, M., ‘ Lebensalter und Leistung,’ Arch. f. d. ges. Psychol., 75, 1430. 
SORENSON, H., ‘ Mental ability over a wide range of adult ages,’ J. Appl. Psychol., 
17, 1933. 
SPEARMAN, om ‘ The abilities of man,’ 1927. 
STONE, C. P., ‘ The age factor in animal learning,’ Genet. Psychol. Monog., 5, 1929. 
STRONG, E. ey ‘ Change of interests with age,’ 1931. 
THORNDIKE, E. L., ‘ Adult learning,’ 1928. 
Tram, K., ‘ Alter und Leistung,’ Industry. Psychotechntk, 7, 1930. 
WEIss, E., ‘ Leistung und Lebensalter,’ Industry. Psychotech., 4, 1927. 
WHITMAN, R. H., ‘ Sex and age differences in introversion-extroversion,’ J. Abn. 
Psychol., 24, 1929. 
