Chapter

 1 II   |            about to surrender the secret of her vast solitudes; a
 2 III  |           Balloon.—Dr. Ferguson’s Secret.~Dr. Ferguson had a friend—
 3 III  | reflections, giving himself up to secret calculations, passing his
 4 III  |           Ah, ha! therein lies my secret, friend Dick. Have faith,
 5 IX   |        preparatory experiments in secret and was satisfied. I have
 6 IX   |        proper to ask what is your secret?”~“Here it is, gentlemen—
 7 X    |            Such, gentlemen, is my secret. It is simple, and, like
 8 XII  |  above-ground, I can tell you the secret. It is just to mix equal
 9 XVIII|           of the Nile, that grand secret which has so long remained
10 XVIII|        have made it surrender the secret of its source!”~“But,” said
11 XXIV |         was thinking, not without secret terror, probably, of the