Geographical Distribution
Present Distribution Cannot Be Accounted for by Differences in Physical Conditions
In considering the distribution of organic beings over the face of the globe, the first great fac...
Means of Dispersal.
Sir C. Lyell and other authors have ably treated this subject. I can give here only the briefest ...
Dispersal during the Glacial Period.
The identity of many plants and animals, on mountain-summits, separated from each other by hundre...
Alternate Glacial Periods in the North and South.
But we must return to our more immediate subject. I am convinced that Forbes's view may be largel...