Summary: study focused on the shedding and eruption of teeth in Copenhagen school children, comparing them with other primates. The publication highlights the importance of understanding serological types for anthropological estimation and the need for continued investigations in this area. However, it also emphasizes that the blood-groups found in humans are also present in anthropoid apes, indicating that blood-groups may not be a reliable means of differentiating human races. The report underscores the significance of serological classification and provides valuable insights into the genetic variations within different populations. Furthermore, the paper discusses the relevance of studying identical and non-identical twins to further explore the genetic basis of blood-groups and their implications in understanding human biology and evolution.