wreck. He and Washington White carried the lads to the
inventor's workshop, and there the boys recovered. When they
were well enough, the professor invited them to live with him,
and, more than that, to take a trip with him North Pole.

They went, in company with Washington and an old hunter, named
Andy Sudds, and some other men, whom the professor took along to
help him.

Many adventures befell the party. They had battles with wild
beasts in the far north, and were attacked by savage Esquimaux.
Once they were caught in a terrible storm. They actually passed
over the exact location of the North Pole, and Professor
Henderson made some interesting scientific observations.

In the second volume of this series, entitled "Under the Ocean to
the South Pole," Professor Henderson, Jack, Mark, Washington and
old Andy Sudds, made even a more remarkable trip. The professor
had a theory that there was an open sea at the South Pole, and he
wanted to prove it. He decided that the best way to get there
was to go under the ocean in a submarine boat, and he and the
boys built a very fine, craft, called the Porpoise, which was
capable of being propelled under water at a great depth.

The voyagers had rather a hard time of it. They were caught in a
great sea of Sargasso grass, monstrous suckers held the boat in
immense arms, and it required hard fighting to get free. The
boys and the others had the novel experience of walking about on
the bottom of the sea in new kinds of diving suits invented by
the professor.