"'Ha! ha! It was elementary,' says Sherlock." Seaton interrupted. "You're heading directly at that largest, oldest, and most intelligent planet, then, I take it, where I can catch me my physicist?"
"Not directly at it, no. I am heading for the place where it will be when we reach it. That is elementary."
"Ouch! That got to me, Mart, right where I live. I'll be good."
"But you are getting ahead of me, d**k—it is not as simple as you have assumed from what I have said so far. The Osnomian astronomers have done wonders in the short time they have had, but their data, particularly on the planets of the outer suns, is as yet necessarily very incomplete. Since the furthermost outer sun is probably the oldest, it is the one in which we are most interested. It has seven planets, four of which a
