The following selection of bibliographical material on the various phases of child study is undertaken to indicate major trends and to synthesize the better material with a minimum of repetition and with a maximum of efficiency and availability. It is qualitative only. (Elaborate quantitative analyses of subject-matter are suggested by the study of physical development by Scammon,196.) Research begins much later than 1658, when Comenius published the first picture-book for children. Mateer (73) excellently summarizes the pioneer studies of Preyer, Lobisch, Tain, Perez, Sigismund, Tiedemann, Vierordt, etc. In America, from 1880 to this day, the tremendous and enthusiastic inspiration of G. Stanley Hall stands out. So great was his influence that only within the last ten years have new and independent methods of research flourished. Thomas and Thomas (96) show some of these later techniques and the changes in trend and problems to be faced. (The slowness of progress is reflected by the fact that not until 1900 was the first Juvenile Court set up-in Chicago.) The world war made possible wholesale measurement of " intelligence " in the army camps; the results are only now being adequately weighed and understood. Present studies are being more carefully thought out and are being carried on by groups having better provisions for intensive study and greater facility in securing adequate numbers of children with which to work. The majority of such groups are connected with large universities having adequate organization and operating modern nursery schools. 1 The general trend of subject matter has been quite definitely from the applied science of pedagogy to the pure science of psychological and sociological research, and from studies of a single child to the analysis of the behavior of children in large numbers and in groups.1 For details of Child Development Research Centers and their work see the July, 1930, issue of Child Study.