"
"Ha! Hum! Yes!" murmured Mr. Roumann, then he said something in
German.
"I beg your pardon," he went on quickly. "I have a habit of
talking to myself in my own language once in a while. What I
said was that I did not know the lads were so young. I am
somewhat apprehensive--"
"Do not be alarmed on the score of their youth," cried Professor
Henderson. "I assure you that they have had a peculiar training,
and, in some scientific attainments, they know as much as I do.
You will not find them too young for our purpose, in case we
decide that the thing can be done."
"I tell you it can be done, and it shall be done," insisted Mr.
Roumann.
"I have my doubts," went on Mr. Henderson.
Jack and Mark must have shown the wonder they felt at this talk
between the professor and his friend, for their guardian turned
to them and said:
"Boys, you must excuse me for not telling you at once the reason
why I sent for you. The truth is that Mr. Roumann has laid a
very strange proposition before me. It is so stupendous that I
hardly know whether to consider it or not.
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