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.
Unit studies, sometimes called thematic units or integrated studies, are very popular with homeschoolers. Unit studies usually use a hands-on approach for effective learning. The child learns by actually experiencing or discovering through different methods and activities, rather than just reading a chapter from a textbook.