[Illustration: A beam of electricity leaped from the ship. Instantly shafts of light spread from the nearest projectile to the ones on either side of it.] Interplanetary commerce, if and when it begins, will be fraught with all of the dangers that accompany pioneering expeditions. There will be the terrible climatic conditions on other worlds to be faced, strange beasts and plants; and perhaps desperate and greedy men. That was the case when every new land was opened on earth and it may be expected to be true when we conquer the solar planets.…
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