The newer Mendelian heredity explains that this is necessarily the fact under the mathematics of present-day genetics. Moreover, if we count our ancestors back to the fall of Rome, we each carry the heredity of 1,073,741,824 individuals, churned over and over by inbreeding of various degrees.
Human heredity is thus an incalculable factor.
Reincarnation does teach, however, that persons of like tendencies tend to come together from past times, from ties of either love or hate. Also individuals mutually engaged in past activities which have left deep marks in their natures, will be drawn together in close relationships. The physical heredity gives the appropriate physical channels through which we reincarnate. Professors Eldridge and Driesch reject such an idea, on evidence which we think is indisputable to those who will study their works. It is by means of the emanations which they emit that the nuclei influence the surrounding protoplasm.