He and Tom Turner kept constant watch on the barometer--not so much to keep themselves informed of the height at which they were traveling as to be on the look-out for a change in the weather.

Evidently some indications had been observed of which it was necessary to make careful note.
Uncle Prudent also remarked that Robur had been taking stock of the provisions and stores, and everything seemed to show that he was contemplating turning back.
"Turning back!" said Phil Evans.

"But where to ?" "Where he can reprovision the ship," said Uncle Prudent.
"That ought to be in some lonely island in the Pacific with a colony of scoundrels worthy of their chief." "That is what I think.

I fancy he is going west, and with the speed he can get up it would not take, him long to get home." "But we should not be able to put our plan into execution.

If we get there--" "We shall not get there!" The colleagues had partly guessed the engineer's intentions.