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.
A home study or homestudy is  a screening of the home and life of prospective adoptive parents prior to allowing an adoption to take place. In some places, and in all international adoptions, a home study is required by law. Even where it is not legally mandated, it may be required by an adoption agency. Depending on the location and agency, different information may be sought during a home study.