certainly have been puzzled since you--or rather since the person we
thought was you--came back last night all bunged up. Give us the
story."

"I will; give me a chance. I guess that villain is gone for good." Andy
Sudds came out with his gun, and insisted on taking a look down the
road and around the premises. The man was nowhere in sight.

"Now we're in for another delay," remarked Jack ruefully, as he gazed
at the smashed window. "It seems as if we'd never get started for the
moon."

"Oh, yes, we will," declared Professor Henderson. "We have some extra
heavy plate glass in the shop, and we can soon put in another
observation window."

"Let's get right to work then," proposed Jack. "That man may come back.
Did you learn who he was, Mark?"

"No, he wouldn't tell his name, and he said he was doing this to get
revenge on us for some fancied wrong. I can't imagine who he is. But
let's work and talk at the same time. I'll tell you all that happened
to me," which he did briefly.

Mark soon got rid of the tramp clothes, and donned an extra suit which
had been packed in his trunk in the projectile. Then he helped replace
the broken window, which, in spite of their haste, took nearly all the
rest of the day to put in place.

"Shall we wait and start to-morrow?" asked Jack, when four o'clock