Self-preservation is the first law of Nature." Just at dusk the train reached Denver, and the dreaded moment of parting came.

There were kisses and tearful good-byes, but not much time was allowed for either.

The last glimpse that Clover had of Katy was as the train moved away, when she put her head far out of the window of Car Forty-seven to kiss her hand once more, and call back, in a tone oracular and solemn enough to suit King Charles the First, his own admonitory word, "Remember!".