children's language, partly by collecting recollections of childhood on
the part of the adult. Finally he experimented directly on the child,
investigating his physical and psychical fatigue and endurance,
acuteness of sensation, power, speed, and exactness in carrying out
physical and mental tasks. He has studied his capacity of attention in
emotions and in ideas at different periods of life. He has studied the
speech of children, association of ideas in children, etc. During the
study of the psychology of the child, scholars began to substitute for
this term the expression "genetic psychology." For it was found that the
big-genetic principle was valid for the development both of the psychic
and the physical life. This principle means that the history of
the species is repeated in the history of the individual; a truth
substantiated in other spheres; in philology for example. The psychology
of the child is of the same significance for general psychology as
embryology is for anatomy. On the other hand, the description of savage
peoples, of peoples in a natural condition, such as we find in Spencer's
Descriptive Sociology or Weitz's Anthropology is extremely instructive
for a right conception of the psychology of the child.

It is in this kind of psychological investigation that the greatest
progress has been made in this century. In the great publication,
Zeitschrift fur psychologie, etc., there began in 1894 a special
department for the psychology of children and the psychology of
education. In 1898, there were as many as one hundred and six essays
devoted to this subject, and they are constantly increasing.

In the chief civilised countries this investigation has many
distinguished pioneers, such as Prof. Wundt, Prof. T. H. Ribot, and
others. In Germany this subject has its most important organ in the
journal mentioned above. It numbers among its collaborators some of the
most distinguished German physiologists and psychologists. As related to
the same subject must be mentioned Wundt's Philosophischen Studien, and
partly the Vierteljahrschrift fur Wissenschaftlichie Philosophie. In
France, there was founded in 1894, the Annee Psychologique, edited
by Binet and Beaunis, and also the Bibliotheque de Pedagogie et de
Psychologie, edited by Binet. In England there are the journals, Mind
and Brain.

Special laboratories for experimental psychology with psychological
apparatus and methods of research are found in many plac