Abstract
In 1933, Koya studied frequency distrbiution of the families in the City of Tokyo according to the number of math and fethath children, Ile showed a remarkable difference between the statistic and expected number which are calculated on the assumption that the birth of male and female children occurs at random i, e, without association with peculiar families. The number of the familiesi n whichm ale clildren or femalec hildren only born was muchl arger than expected. The presenta uthor wantedt o study this Questionw ith Europeanm aterial.
More than 800 pedigreesi n the “Treasuryo f HumanI nheritance” publishedb y Galton Laboratoryw erea nalyzed. The statistica greesw ellw ith the expectedn umber. He further studiedw, ith the samem ateriala nd confirmedth at there is no hereditaryd ispositionto bear male or female child,
