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The liberal reward of labour, by enabling them to provide better

for their children, and consequently to bring up a greater

number, naturally tends to widen and extend those limits. It

deserves to be remarked, too, that it necessarily does this as

nearly as possible in the proportion which the demand for labour

requires. If this demand is continually increasing, the reward of

labour must necessarily encourage in such a manner the marriage

and multiplication of labourers, as may enable them to supply

that continually increasing demand by a continually increasing

population. If the reward should at any time be less than what

was requisite for this purpose, the deficiency of hands would

soon raise it; and if it should at any time be more, their

excessive multiplication would soon lower it to this necessary

rate.