The Guide in Etidorhpa, in chapter 16, comments on the flow of
energy through the shell of the Earth:
http://www.holloworbs.com/Etidorchapter_xvi.htm
" The child ignorant of letters wonders at the resources of those who
can spell and read, and, in like manner, many obscure natural
phenomena are marvelous to man only because of his ignorance. You do
not comprehend the fact that sunlight is simply a matter-bred
expression, an outburst of interrupted energy, and that the
modification this energy undergoes makes it visible or sensible to
man. What, think you, becomes of the flood of light energy that
unceasingly flows from the sun? For ages, for an eternity, it has
bathed this earth and seemingly streamed into space, and space it
would seem must have long since have been filled with it, if, as men
believe, space contains energy of any description. Man may say the
earth casts the amount intercepted by it back into space, and yet
does not your science teach that the great bulk of the earth is an
absorber, and a poor radiator of light and heat? What think you, I
repeat, becomes of the torrent of light and heat and other forces
that radiate from the sun, the flood that strikes the earth? It
disappears, and, in the economy of nature, is not replaced by any
known force or any known motion of matter. Think you that earth
substance really presents an obstacle to the passage of the sun's
energy? Is it not probable that most of this light producing essence,
as a subtle fluid, passes through the surface of the earth and into
its interior, as light does through space, and returns thence to the
sun again, in a condition not discernible by man?" He grasped my arm
and squeezed it as though to emphasize the words to follow. " You
have used the term sunshine freely; tell me what is sunshine? Ah! you
do not reply; well, what evidence have you to show that sunshine (
heat and light ) is not earth-bred, a condition that exists locally
only, the result of contact between matter and some unknown force
expression? What reason have you for accepting that, to other forms
unknown and yet transparent to this energy, your sunshine may not be
as intangible as the ether of space is to man? What reason have you
to believe that a force torrent is not circulating to and from the
sun and earth, inappreciable to man, excepting the mere trace of this
force which, modified by contact action with matter appears as heat,
light, and other force expressions? How can I, if this is true, in
consideration of your ignorance, enter into details explanatory of
the action that takes place between matter and a portion of this
force, whereby in the earth, first at the surface, darkness is
produced, and then deeper down an earth light that man can perceive
by the sense of sight, as you now realize? I will only say that this
luminous appearance about us is produced by a natural law, whereby
the flood of energy, invisible to man, a something clothed now under
the name of darkness, after streaming into the crust substance of the
earth, is at this depth, revivified, and then is made apparent to
mortal
eye, to be modified again as it emerges from the opposite earth
crust, but not annihilated. For my vision, however, this central
light is not a necessity; my physical and mental development is such
that the energy of darkness is communicable; I can respond to its
touches on my nerves, and hence I can guide you in this dark cavern.
I am all eye."
" Ah!" I exclaimed, " that reminds me of a remark made by my former
guide who, referring to the instinct of animals, spoke of that as a
natural power undeveloped in man. Is it true that by mental
cultivation a new sense can be evolved whereby darkness may become as
light ?"
" Yes; that which you call light is a form of sensible energy to
which the faculties of animals who live on the surface of the earth
have become adapted, through their organs of sight. The sun's energy
is modified when it strikes the surface of the earth; part is
reflected, but most of it passes onward into the earth's substance,
in an altered or disturbed condition. Animal organisms within the
earth must possess a peculiar development to utilize it under its new
form, but such a sense is really possessed in a degree by some
creatures known to men.