It is a fear that takes away your reason.

I could have cried out, or run, or done any other foolish thing.
Without saying a word, Addison put the tourmaline crystal into his pocket and picked up the drill and the little bundle of silver-ore specimens, which to carry the more easily he had tied up in his handkerchief.
"Come on," he said in a queer, low tone.

"Let's go find Theodora and Nell.

I guess we'd better go home--if it's coming on night in the middle of the afternoon." He tried to laugh, for Addison had always prided himself on being free from all superstition.

But I saw that he was startled; and he admitted afterwards that he, too, had remembered about that rainbow in the morning, and had also thought of the comet that had appeared a few years before and that many people believed to presage the end of the world.
We started to run back, but it had already grown so dark that we had to pay special heed to our steps.