The rapid modification in physical and mental constitution of the English transplanted to North America, South Africa, Australia and New Zealand has been the result of several geographic causes working through the economic and social media; but it has been ascribed by Darwin and others to the effect of climate.

The prevailing energy and initiative of colonists have been explained by the stimulating atmosphere of their new homes.

Even Natal has not escaped this soft impeachment.

But the enterprise of colonials has cropped out, under almost every condition of heat and cold, aridity and humidity, of a habitat at sea-level and on high plateau.

This blanket theory of climate cannot, therefore, cover the case.