He listened to Frank’s theories for awhile, then began to express his incredulity.
And thus we find them arguing the matter at the opening of our story.
“You may be in earnest, Frank,” said the explorer, with a laugh, “but I think you have tackled a pretty difficult subject. Don’t you agree with me?”
Frank smiled.
“It is not so difficult to solve submarine navigation as aerial flight,” he said; “there is enough in Nature to teach us how the problem may be accomplished.”
“Ah, but it is impossible to always copy Nature.”
“Yet we may draw our plans from her liberal sources.”
“In what way has Nature assisted you in your plan of submarine navigation?”
“She has given me a model.”
“A model?”