"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 single small segment of Space! The larger vehicle seemed speeding back and forth. A dash into the year 1777! as Larry learned from Mary Atwood. And there had been several evidences of the cage halting in 1935. Larry's account explained two such pauses. But the others? Those others, which brought to the City of New York such amazing disaster? We did not learn of them until much later. But Alten lived through them, and presently I shall reconstruct them from his account. The larger cage was difficult to trace in its sweep along the corridors of Time. Never once had Tina and Harl been able to stop simultaneously with it, for a year has so many separate days and hours. The nearest they came was the halt in the night of June 8-9, when they encountered Larry, and, startled, seized him and moved on again. * * * * * Harl continued to gaze through the eyepiece of the detecting instrument. But nothing showed, and the mirror-grid on the table was dark.