Page:Amazing Stories Volume 01 Number 12.djvu/105

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Theory, Design, Construction Operation and Maintenance

33 LEARN AT HOME

These five component parts of a complete Radio Instruction Course are outlined in five volumes that - contain not merely the essentials as so many books do, but more, they contain all that any modern up-to- the-minute textbook on any subject would cover. They are in themselves a COMPLETE radio education teaching every possible portion of Radio science. ‘ Size of each book 6 by 9 inches, with charts, diagrams, descriptions of equipment, etc, SEND NO MONEY for these books.
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Our plan will make you independent—No experience necessary. Get big money class—others are! it, We start IPREME S} Fifth Ave., New York [As to the problem of the six-mile depth of waters; it is admitted that this much water could not recede into the interior of the earth. However, it is quite possible that this condition could have prevailed, not only on this planet, but on many other like bodies somewhere in the universe. It should always be remembered that, geologically, time, as compared to human epochs, is infinite. It should furthermore be remembered that a great deal of the atmosphere, and, therefore, water in the form of vapor, is lost right along into space. The grazing meteorites are responsible for a good deal of this. Furthermore, at very high points in the atmosphere, the earth continuously loses billions of particles of air every minute. While small, during the course of a year—so small, in fact, that it would be difficult to measure it—in the course of geological time, such losses reach tremendous figures.

The latest geological time scale, based on physics, shows us that the age of mammals—that is, the Miocene and Oligocene periods—can be placed about 16,000,000 years ago. The Mesozoic age of reptiles dates back at least 150,000,000 years. The Paleozoic age of fishes and amphibians dates back at least 300,000,000 years, while the Precambrian dates back at least one billion years. During such time, the losses are, of course, tremendous, and even a sheet of water six miles deep would have vanished entirely out into space long before the passing of such a cycle. Our water supply even now is getting smaller and smaller as time goes on. The moon has lost practically all of it, and so has Mars—both of these bodies being far older than the earth.

The point about invisibility, regarding "The Man Who Could Vanish", is explained in the answer to another letter of one of our correspondents.—Editor.]

Editor,

One of your writers, namely A. Hyatt Verrill, certainly does write amazing stories. I am amazed as to why his crab people should develop a semi-human mouth, a big hooked nose, steepled eyes, and hig flap ears. Why should people, developed to such an extent in mental telepathy need ears like a hunting dog?

Why should a civilized people, such as those in "Through the Crater's Rim," walk on their hands, and use their feet, when animals such as rats, squirrels, kangaroos, etc., know enough to use the members nearest their head and eyes?

Why should Dr. Unsinn declare that he does not intend to produce invisibility by causing a body to permit light rays passing through it? How in the world can invisibility otherwise be produced? It is true that if the reflected light cannot be seen, the object itself cannot be seen. But what of the light rays intercepted by that body? If the reflected light rays of a building are invisible, does that permit reflected light rays from a building in the next street to pass through the first building unaltered?

[Our correspondent asks why Mr. Verrill's crab people should develop a semi-human mouth, a big hooked nose, steepled eyes, and big flapped ears; also why should people developed to such an extent in mental telepathy need ears like a hunting dog. To this we can only answer that if our correspondent has ever visited an aquarium or museum of natural history he will readily see that the shapes and varieties of living beings are endless and most astonishing. Some of the most fearful and amazing creatures which have been fished up or dredged from the depths of the ocean by deep sea expeditions prove this point. There are fish with a good sawlike instrument. Other fish are luminous all over, while still others have luminous eyes, characteristics which have been created by their curious environment. There are so many things in nature that we can not explain that it would be futile to try to ennumerate them all. There are many organs in the human body even, such as, for instance, the appendix, for which there is no good explanation; hairs in the face of the male, which certainly are not needed these days, and many other organs, which remain for no good reason as far as we know.

The same answer might hold true about the people who walk on their hands. It is not at all impossible, though perhaps a little far-fetched, that such creatures could exist.

Regarding the invisibility—we refer to another letter published here, about an invisible spider web; as the correspondent says, truly, the spokes of a wheel can not be seen when the wheel is revolving rapidly. The same is true of the blades of an electric fan, or the propeller of an airplane which certainly are broad and solid. You can see a house or a face right through the blades, and while the object thus viewed may appear a little darker, it is still there with all its characteristics, Now take a stick and wave it too and fro rapidly. It becomes invisible. Is it such a far-fetched idea then, that by means of some apparatus, the human body, or anything, for that matter, may be vibrated at such a rapidity that, although standing stationary, it will be not seen? This is not impossible in latter-day science.—Editor.]

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