Or when his admirers, anxious to improve on this, after distinguishing the atmosphere or air, the hydrosphere or water, the lithosphere or crust, and the centrosphere or interior mass, proceed to add that man is the most active portion of an intermittent biosphere, or living envelope of our planet, I cannot feel that the last word has been said about him.
[Footnote 3: Thus the reader of the present work should not fail to study also Dr.Marion Newbigin's _Geography_ in this series.] Or, again, listen for a moment to M.Demolins, author of a very suggestive book, _Comment la route cree le type social_ ("How the road creates the social type").

"There exists," he says in his preface, "on the surface of the terrestrial globe an infinite variety of peoples.
What is the cause that has created this variety?
In general the reply is, Race.

But race explains nothing; for it remains to discover what has produced the diversity of races.

Race is not a cause; it is a consequence.

The first and decisive cause of the diversity of peoples and of the diversity of races is the road that the peoples have followed.
It is the road that creates the race, and that creates the social type." And he goes further: "If the history of humanity were to recommence, and the surface of the globe had not been transformed, this history would repeat itself in its main lines.