hustling me back again, like a nest of ants carrying something they don't want outside their hill. And then you bobbed up."

"Well, my opinion is you saved your life by pulling up your collar," said Tommy. "Looks to me as if it's a case of the survival of the fittest, said fittest being the insect, and the human race taking second place. You know what the humans here live on, don't you?"

"No, what?"

"Shrimps as big as poodles. If you'd seen that girl and the old man getting outside them, you'd realize that there seems to be a food shortage in this part of the world. Say, where in thunder are we, Jimmy?"

"Haven't you guessed yet, Travers?" asked Dodd, a spice of malice in his voice.

"I suppose this is some sort of big hole on the site of the south pole, with warm vapors coming up. Maybe a great fissure in the earth, or something."

Jimmy Dodd's grin, seen in the half-light, was rather disconcerting. "How far do you think we dropped just now?" Dodd asked.

"Why, I'd say several hundred yards," replied Tommy. "What's your estimate?"

"Just about ten miles," answered Dodd.

"What? You're still crazy! Why, we slowed up!"

"Yeah," grinned Dodd, "we slowed up. We're inside the crust of the world. That's the long and short of it. The earth we've known is just a shell over our heads."

"Yeah? Walking head downward, are we? Then why don't we drop to the center of the earth, you damn fool?"

"Because, my dear fellow, you can swing a pailful of water round your head without spilling any of it. In other words, our old friend, centrifugal force. The speed with which the earth is rotating, keeps us on our feet, head downward. To be precise, the center of the earth's gravity lies in the middle of the hollow sphere, of course, but the counteraction of centrifugal force throws it outward to the middle of the ten-mile crust. That's why we slowed down after we were half-way through. We were moving against gravity."

"And what's up there, or down there, or whatever you call it?" asked Tommy, pointing to what ought to have been the sky.

"Nothing. It's the center of the tennis ball, though I imagine it's pretty near a vacuum when you get up a mile or so, owing to the speed of the earth's rotation, which forces the heat into the shell."

"You mean to say you actually believe that stuff you've been handing me?" asked Tommy, after a pause. "Then how did human beings get here, and those damn beetles? And why's the grass red?"

"The grass is red because there's no sunlight to produce chlorophyll. The inhabitants of the deep sea are red or black, almost invariably. In the case of the humans, they've become bleached. My belief is that that man and woman we saw, and those"—he pointed to the vague forms of human beings, who moved across the grass, gathering something—"are survivors of the primitive race that still exists as the Australians. Undoubtedly one of the branches of the human stock originated in antarctica at a time when it enjoyed a tropical temperature, and was the land bridge between Australia and South America."

"And the—beetles?" asked Tommy.

"Ah, they go back to the days when nature was in a more grandiose mood!" replied the archaeologist enthusiastically. "That's the most wonderful discovery of the ages. The world will go crazy over them when we bring back the first living specimens to the zoological parks of the great cities.

"But," Dodd went on, speaking with still more enthusiasm, "of course, this is only the beginning, Tommy. There are ten million species of insects, according to Riley, and it is inevitable that there must be hundreds of thousands of other survivals from the age of the great saurians, perhaps even some of the saurians themselves. Who knows but that we may discover the ancestor of the extinct monotremes, the rhynchocephalia, the pterodactyls, hatch a brood of aepyornis eggs—"

"And," said Tommy tartly, "how are we going to get them back, apart from the little problem of getting out of here ourselves?"

"Don't let's worry about that now," answered Dodd. "It will take ten years of the hardest kind of labor even to begin a classification of the inhabitants of this inner world. I could sit down for ever, and—"

But Jimmy Dodd rose to his feet as a pair of antenna whipped round his neck and jerked him bodily upward.

One of the monster beetles was standing upright behind them, and by its gestures it evidently meant that Dodd and Tommy were to join the crowd of humans in the offing. As Dodd turned upon it with an indignant show of fists, one of the antennae whipped off his fur coat and stung him painfully with the bristle-like attachment at the end.

It was a painful moment when Dodd and Tommy realized that they were powerless against the monstrous beetles. Tommy tried the uppercut with which he had knocked out the deceased monster, but the quick jerks of the present beetle's head were infinitely faster than the movements of his fists, while the antenna had a whiplike quality about them that speedily convinced him that discretion was the card to play.

Under the threat of the curling antenna, Tommy and Dodd moved in the direction of the slowly circulating humans. Numerous tiny rodents, which evidently kept the red grass short, scampered away under their feet. The beetles made no further effort to force them on, but now they could see that a number of the monsters were stationed at intervals around a wide circle, keeping the humans in a single body.

"Good Lord!" ejaculated Tommy, stopping. "See what they're doing, Dodd? They're herding us, like cowboys herd steers. Look at that!"

One of the herd, a male with a long beard, suddenly broke from the herd, bawling, and flung himself upon a beetle guard. The antenna shot forth, coiled around his neck, and hurled him a dozen feet to the ground, where he lay stunned for a moment before arising and rejoining his companions.

"But what are they looking for?" demanded Dodd.

Tommy had not heard him. He had stopped in front of one of the luminous trees and was plucking a fruit from it.

"Jimmy, ever see an apple before?" he asked. "If this isn't an apple, I'll eat my head."

It certainly was an apple, and one of the largest and juiciest that Tommy had ever tasted. It was the reddest apple he had ever seen, and would have won the first prize at any agricultural fair.

"And look at this!" shouted Tommy, plucking an enormous luminous peach from another tree.

They began munching slowly, then, seeing one of the beetle guards approaching them, they moved into the midst of the crowd.

"Did you notice anything strange about those fruit trees?" inquired Dodd, as he munched. "I'll swear they were monocotyledonous, which, after all, is what one would expect. Still, to think that the monocotyledons evolved the familiar drupes, or stone fruits, on a parallel line to the dicotyledons is—amazing!"

A box on the ear like the kick of a mule's hoof jerked the last word from his lips as he went sprawling. He got up, to see the girl standing before him, intense disgust and anger on her face.

She snatched the fruits from the hands of the two Americans and hurled them away. It was evident from her manner that she considered such diet in the highest degree unclean and disgusting; also that she considered herself charged with the duty of superintending Tommy's and Dodd's education, but especially Dodd's.

Taking him by the arm, she propelled him into the midst of the groping humans. She released him, stooped, and suddenly stood up, a shrimp about eighteen inches long in her hand.

Towering over Dodd by six inches, she took his face in her hands and began caressing him; then, seizing his jaws in her strong fingers, she pried them apart, and popped the tail end of the shrimp into his mouth.

Dodd let out a yelp, and spat out the love-gift, to be rewarded with another box on the ear by the