"Say a million," said the other thinker, encouragingly.
"Yes, a million, or possibly a billion . . . but at any rate, ever so many of them."
"Is it possible?" said the other. "But really, you know there are wonderful things in the world. Now, coal . . . take coal . . . "
"Very, good," said his friend, "let us take coal," settling back in his seat with the air of an intellect about to feed itself.
"Do you know that every ton of coal burnt in an engine will drag a train of cars as long as . . . I forget the exact length, but say a train of cars of such and such a length, and weighing, say so much . . . from . . . from . . . hum! for the moment the exact distance escapes me . . . drag it from . . . "
"From here to the moon," suggested the other.
"Ah, very likely; yes, from here to the moon. Wonderful, isn't it?"
"But the most stupendous calculation of all, sir, is in regard to the distance from the earth to the sun. Positively, sir, a cannon-ball—er—fired at the sun . . . "
"Fired at the sun," nodded the other, approvingly, as if he had often seen it done.
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