as determining climate, [153]
effects of, in Tertiary times, [196]
Ocean, Darwin on permanence of, [100]
Oceanic and continental islands, [242]
Oceanic islands a proof of the permanence of oceans, [100]
Oceanic islands, [244]
—the Azores, [247]
general remarks on, [329]
Octodontidæ, [27]
Œnanthe fluviatilis, [361]