taract,
had originally only one room, and two of the sides were formed, as
stated, by the walls of the right-angled rocks, the room being about ten
feet square.

After the water wheel was built and put in and the sawmill erected, they
were enabled to get lumber, and an extension twelve by fifteen feet was
put up, to be used as a sleeping and living room.

A small addition was also added, which was converted into a kitchen, so
that the original enclosure could be used as a storeroom.

A sort of roadway passed the new addition, and beyond was the Cataract,
not fifty feet away. Directly below the Cataract another building was
put up, in one end of which was the sawmill, and at the other end was a
sort of shed in which they had put up a furnace, blacksmith shop, and a
kind of primitive foundry.

Within the workshop work was done during the rainy weather, and it was
made as comfortable as possible.

They were now back, ready to take up active life again. Not that the
past nineteen days were inactive ones. By no means; but they loved the
work which every day had brought to them in the past, and were happy in
the thought that they were accomplishing things of the greatest value to
themselves. They were really tired, and for a few days did little active
work.

"Do you think we have accomplished very much on our trip?" was George's
inquiry the evening of their arrival.

"We saw a light, didn't we?"

The boys laughed, when they saw that the Professor said it with a broad
smile. They had no doubt, but he wished to convey the impression that
they had seen a light, just as many others had, without being able to
understand it. George saw the point at once. "I hope we may be able to
profit by it. But, really, how much more do we know than we knew a month
ago?"

"The West River, the bear, the wildcat, the Baby; why, you had entirely
forgotten him and his cute ways. We learned that there are, without
doubt, savage tribes on the island. I am inclined to think the trip has
taught us something."

The Baby was an interesting little chap. He would sit up at the table
with innocent blinking eyes, and gravely imitate the motions of eating,
especially if there was something sweet in sight.

That night a startling noise was heard, made by the unmistakable tramp
of animals passing their home. Harry was the first to open the small
port, which served as a window.

"Hurrah for our yaks!" There they were, back again, with two addition