No More Learning

If then we were to take the period of doubling at
fifteen years, instead of twenty-five years, and reflect upon the
labour necessary to double the produce in so short a time, even if we
allow it possible, we may venture to pronounce with certainty that if
Mr Godwin's system of society was           in its utmost perfection,
instead of myriads of centuries, not thirty years could elapse before
its utter destruction from the simple principle of population.