If it be certain, that such people would die for want without any resource, must it not follow, that unless their parents had found the means of maintaining them when children, and they themselves the means of subsisting by their industry in supplying wants, they could not have existed beyond their first infancy. This seems to strike deep against the populousness of the old world, where we know that the wants of mankind, with regard to trades and manufactures, were so few. But in those days the wants of mankind were of a different nature. At present there is a demand for the ingenuity of man; then there was a demand for his person and service. Now provided there be a demand for man, whatever use he be put to, the species will multiply; for those who stand in need of them will always feed them, and as long as food is to be found, numbers will increase. In the present times food cannot, in general, be found, but by labour, and that cannot be found but to supply wants. Nobody will feed a free man, more than he will feed the wild birds or beasts of the field, unless he has occasion for the labour of the one or the flesh of the other. In the old world the principles were the same, but the spirit of nations was different. Princes wanted to have numerous armies. Free states sought for power in the number of their citizens. The wants of mankind being few, and a simplicity of manners established, to have encouraged industry, excepting in agriculture, which in all ages has been the foundation of population, would have been an inconsistency. To make mankind labour beyond their wants, to make one part of a state work to maintain the other gratuitously, could only be brought about by slavery, and slavery was therefore introduced universally. Slavery was then as necessary towards multiplication, as it would now be destructive of it. The reason is plain. If mankind be not forced to labour, they will only labour for themselves; and if they have few wants, there will be little labour. But when states come to be formed, and have occasion for idle hands to defend them against the violence of their enemies, food at any rate must be procured for those who do not labour; and as, by the supposition, the wants of the labourers are small, a method must be found to increase their labour above the proportion of their wants.