and Mannix? Where would we be—eh, what? Nowhere—simply nowhere. And yet, one of the quartet is guilty; let's cling to that consolin' fact. It can't be Spotswoode and it can't be Lindquist. Cleaver and Mannix remain: two from four leaves two. Simple arithmetic, what? The only trouble is, this case isn't simple. Lord, no!—I say, how would the equation work out if we used algebra, or spherical trigonometry, or differential calculus? Let's cast it in the fourth dimension—or the fifth, or the sixth. . . ." He held his temples in both hands. "Oh, promise, Markham—promise me that you'll hire a kind, gentle keeper for me."
"I know how you feel. I've been in the same mental state for a week."
"It's the quartet idea that's driving me mad," moaned Vance. "It wrings me to have my tetrad lopped off in such brutal fashion. I'd set my young trustin' heart on that quartet, and now it's only a pair. My sense of order and proportion has been outraged. . . . I want my quartet."
"I'm afraid you'll have to be satisfied with two of them," Markham returned wearily. "One of them can't qualify, and one is in bed. You might send some flowers to the hospital, if it would cheer you any."
"One is in bed—one is in bed," repeated Vance. "Well, well—to be sure! And one from four leaves three. More arithmetic. Three! . . . On the other hand, there is no such thing as a straight line. All lines are curved; they transcribe circles in space. They look straight, but they're not. Appearances, y' know—so deceptive! . . . Let's enter the silence, and substitute mentation for sight."
