At that time we did not know what it was, but, thinking that it might be valuable, we searched the pocket for other crystals, but found no more.
We had both become so much interested in searching for minerals that we had quite forgotten our luncheon.

The sky, I remember, was overcast and the sun obscured; it was also very smoky from forest fires, which in those days were nearly always burning somewhere to the north of us during the summer.
But presently, as Addison was thumping away with the hammer, I noticed that it was growing dark.

At first I thought that it was merely a darker cloud above the smoke that had drifted over the sun, and said nothing; but the sky continued to darken, and soon Addison noticed it.
"Another shower coming, I guess," he said, looking up.

"Don't see any particular clouds, though.

I wonder what makes it so dark ?" "It seems just like night coming on," said I."But it isn't so late as all that, is it ?" "No!" exclaimed Addison.