Interior of the Earth: An Esoteric Study of the Subterranean Spheres

Modern science can speak with authority regarding only a tiniest fraction of the earth's interior. We have, quite literally, scratched just the surface of our planet. Can we truly know what lies beneath our feet, in the unimaginably deep depths of the earth? Can the phenomenon of spiritual investigation add to this question? In this comprehensive volume, with notes and an introduction, Rudolf Steiner's utterances on this theme have been brought together for the first time under one cover. H...