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Updated: May 4, 2025
Renfrey gives us further statistics of great value respecting these several plant zones of the globe, all of which fit so admirably into our theory of plant-distribution, that we can hardly see how the most prejudiced mind can resist the force of its application.
There are some seeming exceptions to these general statements respecting plant-distribution, but they are hardly exceptions when we consider the elevation at which any one species, as the birches for instance, may appear, as they frequently do, in three several zones.
The numerous facts we have already given, and many others that might be arrayed in advocacy of our position, taken in connection with the general facts here presented in regard to plant-distribution, all point directly to climatal and soil conditions as the real cause of dissemination, and not to their migration from continent to continent, and across vast intervening seas and oceans, as the theory of Professor Gray and others would require us to believe.
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