The changed conditions, the hostile forces it finds, necessitate mental ingenuity to adapt them and influence it unconsciously.

To see how potent these influences prove we have but to look at the two great branches of the Aryan family, the one that for so long now has stayed at home, and the one that went abroad.

Destitute of stimulus from without, the Indo-Aryan mind turned upon itself and consumed in dreamy metaphysics the imagination which has made its cousins the leaders in the world's progress to-day.

The inevitable numbness of monotony crept over the stay-at-homes.

The deadly sameness of their surroundings produced its unavoidable effect.