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occurs in the case of our own planet, the polar lights which it gives off being the aurora borealis, which is not due to magnetism but to the earth's central sun. Gardner presents the following theory of the origin of the Aurora Borealis: "Why have scientists never compared the facts of the light cap of Mars with the light that plays over our own polar regions? Do they forget that the auroral display has been observed to take place without any reference to the changing of the ee ee at And if the aurora is shown to be independent of magnetic conditions, what else can it be due to than a source of light? Is not the reflection of the aurora light from the higher reaches of the atmosphere comparable to the projection of the light of the Martian caps into the higher reaches of the Martian atmosphere? And how do scientists explain the fact that the aurora is only distinctly seen in the very far north and only seen in a fragmentary way when we get further south?" Gardner concludes that the aurora borealis is due to the central sun shining through the polar orifice on the night sky; and the variations in the streamers of light are due to passing clouds in the interior, which, in their movements, cut off the light of the central sun and cause the reflection on the sky to keep changing. That the aurora is not due to magnetism or electrical discharges is proven by many observations of Arctic explorers showing there is no disturbance of the compass nor crackling sounds that accompany electrical discharges, when the aurora is most intense. Gardner says: "There are some other considerations which show that the aurora is really due to the interior sun. Dr. Kane, in his account of his explorations, tells us that the aurora is brightest when it is white. That shows that when the aM nate ee 2h ab 8 te I eb i ee ea te et we ke reflection of the sun is so clear that the total white light is reflected, we get a much brighter effect than when the light is cut up into prismatic colors. In the latter case the atmosphere is damp and dense (in the interior of the earth) - that being the cause of the rainbow effect - and through such an atmosphere one cannot see so much. Hence the display is not so bright as it is when the atmosphere is clear and the light not broken up. "Again, if the aurora is the reflection of the central sun, we should expect to see it fully only near the polar orifice, and see only faint glimpses of its outer edges as we went further south. And that is precisely what is the actual fact of the matter. Says Dr. Nicholas Senn in his book, "In the Heart of the Arctics:" "* The aurora, which only occasionally is seen in our latitudes, is but the shadow of what it is to be seen in the polar region.’ "The aurora is not a magnetic or electrical disturbance but simply a dazzling reflection from the rays of the central sun. For if it warms continents and waters in the interior of the earth, if, as we have seen, birds have their feeding and breeding grounds there, if an occasional log or seed or pollen-like dust is seen in the Arctic that came from some such unknown place as we have described, it ought to be possible to obtain enough evidence of such magnetic needle ?