So long as they are humanly made, and so long as it _is_ this flood of moonlight from which the Dweller draws its power of materialization, the Dweller itself, if not the product of the human mind, is at least dependent upon the product of the human mind for its appearance." "Wait a minute, Goodwin," interrupted O'Keefe.

"Do you mean to say you think that this thing is made of--well--of moonshine ?" "Moonlight," I replied, "is, of course, reflected sunlight.

But the rays which pass back to earth after their impact on the moon's surface are profoundly changed.

The spectroscope shows that they lose practically all the slower vibrations we call red and infra-red, while the extremely rapid vibrations we call the violet and ultra-violet are accelerated and altered.

Many scientists hold that there is an unknown element in the moon--perhaps that which makes the gigantic luminous trails that radiate in all directions from the lunar crater Tycho--whose energies are absorbed by and carried on the moon rays.
"At any rate, whether by the loss of the vibrations of the red or by the addition of this mysterious force, the light of the moon becomes something entirely different from mere modified sunlight--just as the addition or subtraction of one other chemical in a compound of several makes the product a substance with entirely different energies and potentialities.
"Now these rays, Larry, are given perhaps still another mysterious activity by the globes through which Throckmartin said they passed in the Chamber of the Moon Pool.