Information about several papers discussed at the symposium "The Radiation Biology of the Fetal and Juvenile Mammal" on May 5-9, 1969 in Richland, Washington is presented. It highlights the presentation of several research related to the calculation of radiation dose to the fetal animal after administration of various radionuclides. Other papers deal with the metabolism of inorganic elements and factors that affect strontium retention in neonatal wire.