They looked quickly up, and Jack saw the
face of a man staring in.
Before he could cry out, there came the sound of Washington's
voice:
"Hey dar! Git away from dere! Skedaddle, now, or I'll
prognostigate yo' inter modicums ob transmigatory infatisamatisms!"
The face disappeared from the window, and the sound of footsteps
in rapid retreat was heard.
CHAPTER VI
BUILDING THE PROJECTILE
"Did you see that?" exclaimed Jack.
"What?" asked Professor Henderson quickly.
"Some one at the window," replied Jack.
"I saw the face," added Mark. "It was a man looking in."
"A man? What sort of a man?" inquired Mr. Roumann, and he showed
some excitement.
"I couldn't tell very well," answered Jack. "I saw him for only
a second. But the man was looking right in."
"Did he have a heavy black mustache?" asked the German, and
strode rapidly toward the window.
"No, he didn't have a mustache at all," said Jack. "He was
smooth-shaven. I'm sure of that."
"Then it can't be he," murmured Mr. Roumann.
"Who did you think it was?" asked Professor Henderson.
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