South Temperate America, poor in species, [53]
climate of, [146]
Southern flora, comparative tenderness of, [528]
Southern plants, why absent in the Northern Hemisphere, [527]
Space, temperature of, [129]
Specialisation antagonistic to diffusion of species, [505]
Species, origin of new, [56]
extinction of, [63]
rise and decay of, [64]
epoch of exceptional stability of, [232]