hese
three years; grown that much older; but to the Time-world of 2930
neither he nor the cage would have been missed.

"That," said Tina, "is what doubtless he did. The cage is traveling
again. But you, Larry, tell us only Migul is in it."

"I couldn't say that of my own knowledge," said Larry. "Mary Atwood
said so. It held only the mechanism you call Migul. And now Migul has
with him Mary and my friend George Rankin. We must reach them."

"We want that quite as much as you do," said Harl. "And to find Tugh.
If he is a friend we must save him; if a traitor--punish him."

Larry began, "But can you get to the other cage?"

"Only if it stops," said Tina. "_When_ it stops, I should say."

"Come here," said Harl. "I will show you."

* * * * *

Larry crossed the glowing room. He had forgotten its aspect--the
ghostly unreality around him. He too--his body, like Harl's and
Tina's--was of the same wraith-like substance.... Then, suddenly,
Larry's viewpoint shifted. The room and its occupants were real and
tangible. And outside the glowing bars--everything out there was the
unreality.

"Here," said Harl. "I will show you. It is not visible yet."

Each of the cages was equipped with an intricate device, strange of
name, which Larry and I have since termed a Time-telespectroscope.
Larry saw it now as a small metal box, with tuning vibration dials,
batteries, coils, a series of tiny prisms and an image-mirror--the
whole surmounted by what appeared the barrel of a small telescope.
Harl had it leveled and was gazing through it.[1]

[Footnote 1: The workings of the Time-telespectroscope involve all the
intricate postulates and mathematical formulae of Time-traveling
itself. As a matter of practicality, however, the results obtained are
simple of understanding. The etheric vibratory rate of the vehicles
while traveling through Time was constantly changing. Through the
telespectroscope one cage was visible to the other across the five
hundred feet of intervening Space when they approached a simultaneous
Time; when they, so to speak, were tuned in unison.

Thus, Harl explained, the other cage would show as a ghost, the
faintest of wraiths, over a Time-distance of some five or ten years.
And the closer in Time they approached it, the more solid it would
appear.]

The enemy cage was not visible, now. But Harl and Tina had glimpsed it
on several occasions. What vast realms Time opens within a s