It was Miss Cullam, too, who had worried most about the lost examination papers which Ruth had been the means of finding (as related in “Ruth Fielding at College”); and the instructor of mathematics had taken a particular interest in the girl of the Red Mill and her personal affairs.

“I haven’t ridden horseback since I was a girl,” she said, in some doubt. “And, my dear! you do not expect me to ride a-straddle as girls do nowadays? Never!”

“Neither will Rebecca,” chuckled Ruth. “But we who have been on the plains before, know that a divided skirt is a blessing to womankind.”

“I do not think I shall need that particular blessing,” Miss Cullam said, rather grimly. “But I believe I will accept your invitation, Ruth Fielding. Though perhaps it is not wise for instructors and pupils to spend their vacations together. The latter are likely to lose their fear of us——”

“Oh, Miss Cullam! There isn’t one of us who has a particle of fear of you,” laughed Ruth.

“Ahem! that is why some of you do not stand so well in mathematics as you should,” said the teacher dryly.

That was a busy day; but the party Ruth was forming made all their plans, subject, of course, to agreement by their various parents and guardians. In one week they were to meet in New York, prepared to make the long journey by train to Yucca, Arizona, and from that point into the mountains on horseback.

Helen found time for a little private investigation; but it was not until she and Ruth were on the way home to Cheslow in the parlor car that she related her meager discoveries to her chum.

“What did you ever learn about Edie Phelps?” Helen asked.

“Oh! Edie? I had forgotten about her.”