maintained during the twentieth century. It is, of course, possible that
chemical discoveries and other scientific improvements may greatly
increase the yield of food from the soil, and that in this way the final
limit to the population of the earth may be further off than now seems
probable. But within a few centuries, at most, this limit must be
reached; and after that we may hope that the world will agree to
maintain an equilibrium between births and deaths, that being the most
stable and the happiest condition in which human beings can live
together.[22]

FOOTNOTES:

[10] Myres, _Eugenics Review_, April, 1915.

[11] Wilamowitz-Moellendorff, _Kultur der Gegenwart_, 2, 4, 1.

[12] Cimon, Pericles, and Socrates all had three sons, and
apparently no daughters.--Zimmern, _The Greek Commonwealth_,
p. 331.

[13] _Cf. (e.g.)_ Plato, _Theaetetus_, 149.

[14] We may suppose that the disproportion of the sexes,
caused by female infanticide, was about rectified by the
deaths of males in battle and civic strife. We do not hear
that the Greek had any difficulty in finding a wife.

[15] Families, he says, were limited to one or two 'in order
to leave these rich.'