"I just like being out of doors," she said carelessly. "And it's all the more odd as I was always wanting to hurry on and catch up the large train."

This was a grinding in of the heel. The large train into which the Gillespies were to be absorbed and an end brought to their independent journeying, had at first loomed gloomily before David's vision. But of late it had faded from the conversation and his mind. The present was so good it must continue, and he had come to accept that first bright dream of his in which he and Susan were to go riding side by side across the continent as a permanent reality. His timidity was swept away in a rush of stronger feeling and he sat erect, looking sharply at her:

"I thought you'd given up the idea of joining with that train?"

Susan raised the eyebrows of mild surprise:

"Why did you think that?"

"You've not spoken of it for days."

"That doesn't prove anything. There are lots of important things I don't speak of."

"You ought to have spoken of that."

The virile note of authority was faint in his words, the first time Susan had ever heard it. Her foot was in a fair way to be withdrawn from the slave's neck. The color in her cheeks deepened and it was she who now dropped her eyes.

"We had arranged to join the train long before we left Rochester," she answered. "Everybody said it was dangerous to travel in a small party. Dr. Whitman told my father that."

"There's been nothing dangerous so far."

"No, it's later when we get into the country of the Sioux and the Black-feet. They often attack small parties. It's a great risk that people oughtn't to run. They told us that in Independence, too."

He made no answer and she eyed him with stealthy curiosity. He was looking on the ground, his depression apparent. At this evidence of her ability to bring joy or sorrow to her slave she relented.

"You'll join it, too, won't you?" she said gently.

"I don't know. The big trains move so slowly."

"Oh, you must. It would be dreadfully dreary to separate our parties after we'd traveled so long together."

"Maybe I will. I haven't thought about it."

"But you must think about it. There's no knowing now when we may come upon them - almost any day. You don't want to go on and leave us behind, do you?"

He again made no answer and she stole another quick look at him. This mastery of a fellow creature was by far the most engrossing pastime life had offered her. There was something about him, a suggestion of depths hidden and shut away from her that filled her with the venturesome curiosity of Fatima opening the cupboards in Bluebeard's castle.

"We'd feel so lonely if you went on and left us behind with a lot of strange people," she said, with increasing softness. "We'd miss you so."

The young man turned quickly on her, leaned nearer, and said huskily:

"Would you?"

The movement brought his face close to hers, and she shrank back sharply, her hand ready to hold him at a distance. Her laughing expression changed into one of offended dignity, almost aversion. At the same time his agitation, which had paled his cheeks and burst through his shy reserve, filled her with repulsion. For the moment she disliked him. If he had tried to put his hand upon her she would have struck him in quick rage at his presumption. He had not the slightest intention of doing so, but the sudden rush of feeling that her words had evoked, made him oblivious to the startled withdrawal of her manner.