algam?"

"That is one of the simplest things in the arts. Tin and mercury unite
by merely rubbing them together; see how easily they combine to form
just such a surface as you want."

"Isn't that fine? But as that shines so nicely, what is the need of
putting a glass over it?"

"Simply to protect the amalgamated surface."

The largest piece of glass thus far made was sixteen by twenty-four
inches, and the boys selected the most perfect pane, and in a short time
a very good mirror had been turned out.

"It has occurred to me that it would be good policy to make a number of
small mirrors, say six inches square. They would be a valuable asset to
us in our next expedition."

This opened the eyes of the boys to the commercial utility of the work
they were engaged in for the first time. George rushed over and brought
Tom and Harry to the laboratory, and exhibited the mirrors, and
explained that they intended to make a number of small ones to take with
them.

"That is a capital idea. Won't the natives go wild over them?"

They were at work at once, first cutting up some of the glass the
requisite size, and before the afternoon closed they had several small
ones in addition to the large one.

The large one was carried over to the living room, and when it was
brought in and hung against the wall John's face lighted up, when they
told him of the work required to turn out the glass, and to make the
amalgam.

"What a glorious opportunity you boys are having. How anxious I am to
get up and help you. What a splendid mirror that is. You surprise me
with the character of your work."

"We are going to have real windows in the new house."

At this instant Chief appeared at the door, and as he moved forward in
front of the glass he started back in fright as his own image appeared
to him. All of them laughed, and as he was now at one side of the mirror
he could not see himself. But Harry mischievously turned it, and then it
dawned on the Chief that it was simply a perfect representation of
himself.

All savages know of the glistening qualities of surfaces, but few of
them, as was the case with Chief, had ever seen any made with the white
amalgam, which, of course, made a perfect counterfeit resemblance.

But Harry delighted him beyond measure when he presented one of the
small mirrors, and George took a piece of the ramie cloth and folded it
around the mirror, a proceeding Chief could not understand until John
showed him