The facts were recorded by Polybius, [14] who expressly states that at the time of which he is writing serious pestilences did not occur, and that depopulation was caused by the selfishness of the Greeks, who, being addicted to pleasure, either did not marry at all or refused to rear more than one or two children, lest it should be impossible to bring them up in extravagant luxury. This ancient historian also noted that the death of a son in war or by pestilence is a serious matter when there are only one or two sons in a family. Greece fell to the conquering Romans, and they also in course of time were infected with this evil canker. There came a day when over the battlements of Constantinople the blood-red Crescent was unfurled. Later on all Christendom was threatened, and the King of France appealed to the Pope for men and arms to resist the challenge to Europe of the Mohammedan world. The Empire of the Turk spread over the whole of South-Eastern Europe. But once more the evil poison spread, this time into the homes in many parts of Islam, and to-day the once triumphant foes of Christianity are decaying nations whose dominions are the appanage of Europe. In face of these facts it is sheer madness to assume that all the Great Powers now existing will maintain their population and prove immune from decay. Indeed, the very propaganda against which this Essay is directed is in itself positive proof that the seeds of decay have already been sown within the British Empire. Yet, in an age in which thought and reason are suppressed by systematised confusion and spiritless perplexity, the very simplicity of a truth will operate against its general acceptance. From the theological point of view, the myth of overpopulation is definitely of anti-Christian growth, because it assumes that, owing to the operation of natural instincts implanted in mankind by the Creator, the only alternative offered to the race is a choice between misery and vice, an alternative utterly incompatible with Divine goodness in the government of the world. [Footnote 1: The birth-rate is the number of births per 1,000 of the whole population. In order to make a fair comparison between one community and another, the birth-rate is often calculated as the number of births per 1,000 married women between 15 and 45 years of age, as these constitute the great majority of child-bearing mothers. This is called the _corrected birth-rate_.] [Footnote 2: _Economic Review_, January 1892.] [Footnote 3: So says the Secretary of the Malthusian League. Vide _The Declining Birth-rate_, 1916, p. 88.] [Footnote 4: Bagehot, _Economic Studies_, p. 193.] [Footnote 5: To assign a personality to "Nature" is, of course, a mere _façon de parler_; the believer holds that the "course of Nature" is an expression of the Mind and Will of the Creator.] [Footnote 6: _Problems of Population_, p. 382.] [Footnote 7: _The Malthusian_, July 15, 1921.] [Footnote 8: _Lancet_, 1915, vol. ii, p. 862.]