True, when first she took her survey of those who were to be her fellow-travellers at the "transfer" on the Missouri, she decided that here was one against whom it would be necessary to guard the approaches. She had good and sufficient reasons for wanting no young man as attractive in appearance as this one making himself interesting to pretty Nellie on their journey. She had already decided what Nellie's future was to be. Never, indeed, would she have taken her to the gay frontier station whither she was now _en route_, had not that future been already settled to her satisfaction. Nellie Travers, barely out of school, was betrothed, and willingly so, to the man she, her devoted elder sister, had especially chosen. Rare and most unlikely of conditions! she had apparently fallen in love with the man picked out for her by somebody else. She was engaged to Mrs. Rayner's fascinating friend Mr. Steven Van Antwerp, a scion of an old and esteemed and wealthy family; and Mr. Van Antwerp, who had been educated abroad, and had a Heidelberg scar on his left cheek, and dark, lustrous eyes, and wavy hair,--almost raven,--was a devoted lover, though fully fifteen years Miss Nellie's senior. Full of bliss and comfort was Mrs. Rayner's soul as she journeyed westward to rejoin her husband at the distant frontier post she had not seen since the early spring. Army woman as she was, born and bred under the shadow of the flag, a soldier's daughter, a soldier's wife, she had other ambitions for her beautiful Nell. Worldly to the core, she herself would never have married in the army but for the unusual circumstance of a wealthy subaltern among the officers of her father's regiment. Tradition had it that Mr. Rayner was not among the number of those who sighed for Kate Travers's guarded smiles. Her earlier victims were kept a-dangling until Rayner, too, succumbed, and then were sent adrift. She meant that no penniless subaltern should carry off her "baby sister,"--they had long been motherless,--and a season at the sea-shore had done her work well. Steven Van Antwerp, with genuine distress and loneliness, went back to his duties in Wall Street after seeing them safely on their way to the West. "Guard her well for me," he whispered to Mrs. Rayner. "I dread those fellows in buttons." And he shivered unaccountably as he spoke. Nellie was pledged, therefore, and this youth in the Pullman was not one of "those fellows in buttons," so far as Mrs. Rayner knew, but she was ready to warn him off, and meant to do so, until, to her surprise, she saw that he gave no symptom of a desire to approach. By noon of the second day she was as determined to extract from him some sign of interest as she had been determined to resent it. I can in no wise explain or account for this. The fact is stated without remark.