The assumed reasons are such as these.

The negroes will not cultivate the cane _without the whip_.

How is this known?
Simply because _they never have_, to any great extent, in Jamaica.

Such, it has been shown, was the opinion formerly in Barbadoes, but it has been forever exploded there by experiment.

Again, the negroes are _naturally improvident_, and will never have enough foresight to work steadily.