"The humans have arrived rather late in the planet's history. Or--and this is more likely--Sanus is somewhat smaller than the earth, and therefore has cooled off sooner. At any rate, the relationship between the age of the planet and the age of its human occupancy differs from what it is on the earth." "I don't quite see," from Smith, "what that's got to do with it." "No? Well, go back to the first point: the dried-up appearance of things. That means, their air and water are both less extensive than with us, and for that reason there are far fewer clouds; therefore, it is quite possible that there has been no lightning within the memory of the humans." "How so?" demanded the geologist. "Why, simply because lightning depends upon clouds. Lightning is merely the etheric electricity, drawn to the earth whenever there is enough water in the air to promote conductivity." "Yes," agreed Smith; "but--what of it?" Kinney went on unheeding. "As for volcanoes--probably the same explanation accounts for the lack of these also. You know how the earth, even, is rapidly coming to the end of her 'volcanic period.' Time was when there were volcanoes almost everywhere on the earth. "The same is likely true of Sanus as well. The point is," and the doctor paused significantly, "there have been no volcanic eruptions, and no lightning discharges within the memory of Sanusian man!" What was he getting at? The others eyed him closely. Neither Van Emmon nor Smith could guess what he meant; but Billie, her intuition wide awake, gave a great jump in her chair. "I know!" she cried. A flood of light came to her face. "The Sanusians-- no wonder they let the bees put it over on them! "They haven't got FIRE! They've never had it!" VIII FIRE! From the corner of his eyes Kinney saw Van Emmon turn a gaze of frank admiration at his wife. It lasted only a second, however; the geologist remembered, and masked the expression before Billie could detect it. Smith had been electrified by the idea. "By George!" he exclaimed two or three times. "Why didn't I think of that? It's simple as A, B, C now!" "Why," Van Emmon exulted, "all we've got to do is put the idea of fire into their heads, and the job is done!" He jumped around in his chair. "Darn those bees, anyhow!" "And yet," observed the doctor, "it's not quite as simple as we may think. Of course it's true that once they have fire, the humans ought to assert themselves. We'll let that stand without argument." "Will we?" Smith didn't propose to back down that easy. "Do you mean to say that fire, and nothing more than fire, can bring about human ascendency?" The doctor felt sure. "All the other animals are afraid of fire. Such exceptions as the moth are really not exceptions at all; the moth is simply driven so mad by the sight of flame that it commits suicide in it. Horses sometimes do the same. "Humans are the ONLY creatures that do not fear fire! Even a tiny baby will show no fear at the sight of it."