blastoderm: the germinal membrane from which the organs of the embryo are formed. Explanation of Terms Used in Entomology John. B. Smith He it was who introduced the terms Keimhaut (blastoderm) and Keimblatt (germ-layer).
Child Study. Child study, also called paidology or experimental pedagogy, was the attempt to apply the methods of modern science to the investigation of children in order to discover the laws of normal child development.
1 observations of a target child can form part of a longitudinal study that observes a child's development and repeats the observation at a later age and stage. 2  Children change more slowly, but over several months a baby will develop new skills at a fascinating rate.