"Now, see here!" He laid his right forefinger to his left palm. "Suppose a Martian were visiting the earth. He wouldn't at first be able to distinguish the properties of things. So, seeing these four thousand lamp-posts, he might consider them as a part of the Terrene flora—queer trees."

It was like a game of chess, and it was evident that she could not foresee his next move. The detour was too complicated. She seemed, by her attitude, to be on her guard, but allowed him, with a nod of assent, to proceed.

"Now, suppose you have the Martian, or let us call it the uncorrelative point of view. Suppose you use brain-cells that have hitherto been quiescent or undeveloped."

"I don't exactly follow." Her attention wandered.

He probed it. "Suppose I should get up and kiss you."

She awoke suddenly.

"You see what I mean now?" he continued. "You exploded a new cell then. You gained a new point of view with regard to me. Don't be afraid. I'm not going to kiss you."

"Indeed, you're not!" Her alarm subsided; her resentment, rising to an equal level, was drawn off in a smile at the absurdity of the discussion.

He went on: "But you must acknowledge that I have, at least, produced a psychological condition. I'm going to use that new cell again." He waited for her answer.

"Dear me!" she exclaimed at last. "We're getting very far away from the lamp-posts. I'm quite in the dark."