Great rushes of vapour driven by mighty winds; great seas, for the most part calm.

Then upheavals and volcanoes spouting fire.

Then tropic scenes of infinite luxuriance.

Terrific reptiles feeding on the brinks of marshes, and huge elephant-like animals moving between palms beyond.

Then, in a glade, rough huts and about them a jabbering crowd of creatures that were only half human, for sometimes they stood upright and sometimes ran on their hands and feet.
Also they were almost covered with hair which was all they had in the way of clothes, and at the moment that I met them, were terribly frightened by the appearance of a huge mammoth, if that is the right name for it, which walked into the glade and looked at us.