Man From The Moon

What was the origin of races? Did all of us--Yellow, Black and White--start our generations in similar manner? How far afield of the truth are anthropologists?
excerpt
We stood on the eastern rim of Crater Mound--my friend Professor Thompson, the noted selenographer, and I. Dusky shadows lengthened and grew more intense in the great, deep basin before us, as the Sun, his face reddened as if from his day's exertions, sank slowly beyond the western rim.
Behind us, Alamo Edwards, the dude wrangler who had brought us out from Canyon Diabolo two weeks before, was dividing his time between the chuck wagon and our outdoor cookstove in the preparation of our evening meal, while our hobbled horses wandered about near-by, searching out clumps of edible vegetation.
How is the story progressing, Jim? asked the professor, referring to a half finished novel I had brought out with me to occupy my time with, while my friend puttered among the stones and rubble in the vicinity.
I've reached an impasse-- I began.
And so have I, rejoined my friend dejectedly, but of the two, mine is far the worst, for yours is in an imaginary situation, while mine is real. You will eventually solve your problem by using your imagination, which has no fixed limitations. I can only solve mine by using my reason, which is limited to deductions from facts. If I do not find sufficient facts either to prove or disprove my theory, what have I? A hypothesis, ludicrously wobbling on one puny leg, neither able to stand erect among established scientific truths nor to fall to dissolution among the mistaken ideas of the past.