halve oft, then?"
"Have off what?… Oh!" The rock chortled. "Aye, foolish lad! Whene'er I increase far enough!"
"Didst thou divide today?"
"Divide today into what? Oh! Morn and afternoon, of course! Nay, I did not—the sun did that."
"Whose son? Oh! Thou dost speak of the orb in the sky! Yet didst thou split when it rose to its highest?"
"Aye, lad, every day Ihavel 'Tis fertile land here, midst the leaves! And I do take my leave when'er I may!"
"Dost thou never work, then?"
"Nay, I exist but to make music! A bonny life it is!"
"So long as there is witch-moss by for thou to roll into," Cordelia returned. "Yet wherefore art thou hardened?"
"Why, for that I've aged. All things must needs grow hard as they grow old."
"Not every thing," Rod said quickly, with a glance at Gwen.
"It is not entirely true," Fess agreed. "Still, I must admit that is the common progression."
"Yet an it hath progressed as its progenitor did…" Magnus stood, gazing thoughtfully off into the trees.
"Aye." Gregory pointed. "Yon doth continue the vector we did tread, brother!" Page 21
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"Another hypothesis?" Fess was ever alert for the sounds of learning.
"Nay, further evidence for the one we've tested. An we backtrack farther on this vector, Fess, we should discover the parent of this parent rock."
Fess nodded judiciously. "That is a warranted extrapolation, boys. Yet time grows short; let us send the spy-eye." The pommel of his saddle sprang up, and a metal egg rose out of it.
"Fun!" Cordelia cried, and the children crowded around Fess's withers, where a section of his hide slid up to expose a video screen that glowed to life, showing a bird's-eye view of the immediate area. They could see Fess's head, neck, and back with their own four heads clustered around, growing smaller in the screen and swinging off to the left.
"I did not know of this," Gwen told Rod.
"Never thought to tell you," he admitted. "Remind me to dig up his specifications chart for you one of these days."
The rock increased the volume of its music, miffed at being so suddenly ignored.
"Cordelia," Gwen said, "cease tapping thy foot." Cordelia glowered, but stopped.
On the screen, greenery streamed past faster and faster as the spy-eye shot toward the west. Then, suddenly, it slowed to a halt.
"Three hundred meters," Fess said, "the same distance we have come from the first stone. Here is the audio, children."
From the grille below the screen music blared, faster than that in the air around them, and with a heavier beat. The music from the speaker jarred with the music around them, out of phase; the children winced, and Fess turned it down. "There is another music rock nearby, of a certainty. Let the eye descend, Fess." The leaves on the screen seemed to swim upward, past the edges of the frame and out, until the brown of fallen leaves filled the screen. The brush swelled until the children could see the outlines of each stick and branch.
" 'Tis there!" Geoffrey cried.
"Directly where we said 'twould be," Magnus said, with pride.
" Tis a darker gray." Cordelia pursed her lips. "Would it be harder, Fess?"
"Since this stone is harder than the first we found, and since it maintains that hardness comes with age, I should say the prospect is likely, Cordelia. Can you make any other inferences?" The children were silent, startled by the question. Then Magnus said slowly, "Thou dost mean that an we seek farther in this direction, we shall discover more rocks."
"That does seem likely."
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"And then the farther away they are, the harder they will be?" Geoffrey asked.
"I would presume so, though the spy-eye cannot test it."
"Yet it can see if they are there. Send it farther"— Magnus eyed the angle of the sunlight that streamed through gaps in the trees—" farther west, Fess."
The scene on the screen