The Wealth of Nations by Part 1 Chapter 8 Page 18

in less than five hundred years. In the British colonies in North America, it has been found that they double in twenty or five-and-twenty years. Nor in the present times is this increase principally owing to the continual importation of new inhabitants, but to the great multiplication of the species. Those who live to old age, it is said, frequently see there from fifty to a hundred, and sometimes many more, descendants from their own body. Labour is there so well rewarded that a numerous family of children, instead of being a burthen, is a source of opulence and prosperity to the parents. The labour of each child, before it can leave their house, is computed to be worth a hundred pounds clear gain to them.

A young widow with four or five young children, who, among the middling or inferior ranks of people in Europe,