Using the data of ponderal growth of the hypophysis, thyroid, adrenals, thyrnus, testes and ovaries of thirty specimens from each of both sexes of Japanese human fetuses from the third to the tenth fetal month, the correlation coefficients of the ponderal growth for each paired organ system following their development were examined. From the obtained results it seems to be concluded as follows: 1) All the correlation coefficients for the paired endocrine organ system showed high correlation values. These dates were highly significant (P
