Thor frequently battled frost and fire giants to protect Asgard and Midgard.
The Oahspe Thor’s leadership and divine authority echo the Norse Thor’s role as a heroic defender of Asgard and Midgard.
He dwelt with the twelve Æsir, or gods, upon Asgard, the Norse Olympus, which arose out of Midgard, a land half-way between the regions of frost and fire (to wit, in a temperate climate).
Result: The creation of Midgard (Earth) and the establishment of a world inhabited by gods and humans, governed by a more structured pantheon.
He dwelt with the twelve Æsir, or gods, upon Asgard, the Norse Olympus, which arose out of Midgard, a land half-way between the regions of frost and fire (to wit, in a temperate climate).
Midgard, in Donnelly’s wording, is the land halfway between frost and fire, a temperate middle world from which Asgard arises.