He opened a locker and disclosed a pile of fur garments. There were big
coats, caps and boots, everything made with a furry surface within as
well as without.

"Any one would think you were going into some cold country, professor,"
said Jack, looking at the warm garments.

"So we are! We are going to find the north pole!" exclaimed the old
inventor.

"The north pole?" cried Mark.

"That's what I said. Do you boys want to go along in the _Monarch_ to a
place where never mortal man has been?"

At that instant there came a loud knock at the door.




CHAPTER V

A PLAN TO SEEK THE NORTH POLE


"Hark! What was that?" exclaimed Professor Henderson in a hoarse
whisper.

"Sounded like some one at the door," replied Mark.