No one else speaks it.

I have a fear that you'll be terribly lonely as you travel along the trail, Kitty Tynan." A light of pleasure came into Kitty's eyes, though her face was a little drawn.

"You really do think I'm original--that I'm myself and not like anybody else ?" she asked him with a childlike eagerness.
"Almost more than any one I ever met," answered the Young Doctor gently; for he saw that she had her own great troubles, and he also felt now fully what this comedy or tragedy inside the house meant to her.

"But you're terribly lonely--and that's why: because you are the only one of your kind." "No, that's why I'm not going to be lonely," she said, nodding towards the corner of the house where John Sibley appeared.
Suddenly, with a gesture of confidence and almost of affection, she laid a hand on the Young Doctor's breast.

"I've left the trail, doctor-man.
I'm cutting across the prairie.