in two thousand years the difference would be almost
incalculable, though the produce in that time would have
increased to an immense extent.

No limits whatever are placed to the productions of the
earth; they may increase for ever and be greater than any
assignable quantity, yet still the power of population being a
power of a superior order, the increase of the human species can
only be kept commensurate to the increase of the means of
subsistence by the constant operation of the strong law of
necessity acting as a check upon the greater power.

The effects of this check remain now to be considered.

Among plants and animals the view of the subject is simple.
They are all impelled by a powerful instinct to the increase of
their species, and this instinct is interrupted by no reasoning
or doubts about providing for their offspring. Wherever therefore
there is liberty, the power of increase is exerted, and the
superabundant effects are repressed afterwards by want of room
and nourishment, which is common to animals and plants, and among
animals by becoming the prey of others.

The effects of this check on man are more complicated.
Impelled to the increase of his species by an equally powerful
instinct, reason interrupts his career and asks him whether he
may not bring beings into the world for whom he cannot provide
the means of subsistence. In a state of equality, this would be
the simple question. In the present state of society, other
considerations occur. Will he not lower his rank in life? Will he