In the present paper, the authors observed the relations between mother and her new born baby from the view point of the isoagglutinins in the sera from both mother and the umbilical cord of her new born baby.
A total of 449 combinations of mother and new born baby were examined and the results were tabulated by the presence or absence of the isoagglutinins in the sera from the umbilical cord of the new born baby as follows.
