“No, all right; there’s a box of matches in the table-drawer up-stairs.”

They pushed on, Tom closing the gate, which was nearly torn from his hand, while, as they ascended to the mill, the wind came with redoubled violence, and they had quite a struggle to get, to the door.

“It is terrible,” panted Uncle Richard, as soon as they were inside with the door closed, and the wind shrieking and roaring around the tall building as if seeking to sweep it away.

They mounted in profound darkness to the laboratory, where the matches were found, and all the time the trap-door overhead was being lifted a few inches every minute, and fell with a clap, while the shrieking of the wind, and the rattling and banging of the woodwork in the observatory, sounded ominous of danger to the work of many, many months.

“Time we came, Tom,” said Uncle Richard grimly, as the lantern was lit, and the broken pane replaced by the covers torn from an old book just about the size.

“Yes, quite,” replied Tom. “Come on.”

He stepped quickly to the ladder-like stairs, sprang up, threw open the trap-door, and was about to enter the room, when the trap-door was flung back upon him violently.

“Hurt?” shouted Uncle Richard.

“Yes; not much,” cried Tom, and thrusting the trap-door open again, he forced it back, and, aware now of the danger, held it firmly as he got up; and then, while his uncle followed with the light, closing it again directly and securing it with a bolt.

Tom’s heart beat as the dim light of the lantern was thrown upon the great telescope, for fear that it should have met with injury, but to his great delight the top was directed right away from the open shutter, which now gave evidence of its loose state by yielding to the pressure of the wind, and giving a tremendous bang.