In reality a high birth-rate may coexist with a low death-rate, or with a high death-rate. For example, there is a difference between natural and artificial poverty, the first being brought about by God, or, if any reader prefers to have it so, by Nature, and the second being made by man. Under conditions of natural poverty small groups of people in an open country are surrounded by land not yet cultivated: whereas artificial poverty means a population overcrowded and underfed, living in dark tenements or in back-to-back houses, breathing foul air in ill-ventilated rooms seldom lit by the sun, working long hours in gas-lit workshops for a sweated wage, buying the cheapest food in the dearest market, and drugged by bad liquor. In either case their existence is threatened, although for very different reasons, and the birth-rate rises; but under conditions of natural poverty the death-rate is low, whereas in slums the death-rate is high. Section 3. THE LAW OF DECLINE It would appear, then, that under conditions of hardship the birth-rate tends to rise, and that in circumstances of ease the birth-rate tends to fall. If the existence of the inhabitants in a closed country is threatened by scarcity, the birth-rate tends to rise. For example, "In some of the remote parts of the country, Orkney and Shetland, the population remained practically stationary between the years 1801 and 1811, and in the next ten years, still years of great scarcity, it increased 15 per cent." [56] The governing principle may be expressed in the following generalisation. When the existence of a community is threatened by adversity the birth-rate tends to rise; but when the existence of a community is threatened by prosperity the birth-rate tends to fall. By adversity I mean war, famine, scarcity, poverty, oppression, an untilled soil, and disease: and by prosperity I mean wealth, luxury, idleness, a diet too rich--especially in flesh meat--and over-civilisation, whereby the physical laws of nature are defied. Now the danger of national decline owing to prosperity can be avoided by a nation that observes the moral law, and this is the most probable explanation of the fact that in Ireland, although the general prosperity of the people has rapidly increased since George Wyndham displaced landlordism over a large area by small ownership, the birth-rate has continued to rise. Moreover, the danger to national existence, as we have already indicated (Chapter I, Section. 10) is greater from moral than from physical catastrophes, and when both catastrophes are threatened the ultimate issue depends upon which of the two is the greater. Furthermore, it would appear that moral catastrophes inevitably lead to physical catastrophes. This is best illustrated by the fate of ancient Greece. Section 4. ILLUSTRATED FROM GREEK HISTORY [Reference: Dangers]