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"How about that great irl" Can you connect that with the catastrophe?"

"I think so My idea is that, in so sucked down into the interior of the earth and then hurled out again; reat central lake or sea has fore systeed and reversed in the most curious and unaccountable ate everything thoroughly, that this vast chas"

These and many other questions perplexed the travelers, but ap and to determine if it had, as they hoped, another side, or if it were indeed the edge of an enormous mass split bodily off the earth

Stern believed he had an answer to this problem on the afternoon of the second day Forhis penduluulations, and covered the surface of the smooth stone with X's, Y's, Z's, sines and cosines and abstruse for

At last he finished the final equation, and, with a sain

Back to the girl, as cooking over an odorous fire of cedar, he ladly "Making reasonable allowances for depth, I've got it!"

"Got what?"

"The probable width!"

"Oh!" And she stood gazing at hiraceful "Youthe chasm a hundred miles' depth That's more than anybody could believe possible--twice as much On that assumption, my tests show the distance to the other side--and there is another side, by the way!--can't be over--"

"Five hundred oing on a liberal allowance for error, too It may not be over seventy-five The--"

"But if that's as far as it is, why can't we see the other side?"

"With all that che constantly? Who knohat ele place?"

"Polarization?"

"I ht? No wonder we can't see! But we can fly! And we're going to, what's o, then?" she asked, her eyes lighting up joyfully at thought of the adventure