surrounded by air, and over or outside the atmosphere is something different again. The outer layer beyond the atmosphere is first of all what may be described as a sort of warmth mantle round the Earth. If we could ascend straight from the Earth through the atmosphere, we should enter a zone of very different warmth conditions, surprisingly different from what we know on the Earth's surface. At a certain distance from the Earth in space, the contents of this warmth sphere perform much the same office as the atmosphere itself within and below that zone. What of the region beyond? Here (see Diagram 21) we represent the extra-telluric warmth sphere, and here the atmosphere; and beyond, the polar complement of the atmosphere, a region wherein conditions are the complete opposite of those within the atmosphere. In that region, in a state of — if I may coin the word — de-aeration, where the very existence of air is annulled, is the source of what shoots up through the de-aeration and is sent toward us as light.
are aligned the vital forces themselves, which are also in attendance, as it were, if man is exposed to increased light and increased chemical influence. Thus both the action of chemical forces and the action of vital forces, carried by the light, are extraordinarily beneficial, provided always — and this is all important — the dose is correctly estimated, and care is taken to avoid excessive exposure.