An obscure sense of the painful incident must have lingered with her after its memory had perished.  One afternoon when Lanfear and her father went with her to the military concert in the sycamore-planted piazza near the Vacherie Suisse, where they often came for a cup of tea, she startled them by bowing gayly to a young lieutenant of engineers standing there with some other officers, and making the most of the prospect of pretty foreigners which the place afforded.  The lieutenant returned the bow with interest, and his eyes did not leave their party as long as they remained.  Within the bounds of deference for her, it was evident that his comrades were joking about the honor done him by this charming girl.  When the Geralds started homeward Lanfear was aware of a trio of officers following them, not conspicuously, but unmistakably; and after that, he could not start on his walks with Miss Gerald and her father without the sense that the young lieutenant was hovering somewhere in their path, waiting in the hopes of another bow from her.  The officer was apparently not discouraged by his failure to win recognition from her, and what was amounting to annoyance for Lanfear reached the point where he felt he must share it with her father.  He had nearly as much trouble in imparting it to him as he might have had with Miss Gerald herself.  He managed, but when he required her father to put a stop to it he perceived that Gerald was as helpless as she would have been.  He first wished to verify the fact from its beginning with her, but this was not easy.

“Nannie,” he said, “why did you bow to that officer the other day?”

“What officer, papa?  When?”

“You know; there by the band-stand, at the Swiss Dairy.”

She stared blankly at him, and it was clear that it was all as if it had not been with her.  He insisted, and then she said:  “Perhaps I thought I knew him, and was afraid I should hurt his feelings if I didn’t recognize him.  But I don’t remember it at all.”  The curves of her mouth drooped, and her eyes grieved, so that her father had not the heart to say more.  She left them, and when he was alone with Lanfear he said: 

“You see how it is!”

“Yes, I saw how it was before.  But what do you wish to do?”

“Do you mean that he will keep it up?”

“Decidedly, he’ll keep it up.  He has every right to from his point of view.”

“Oh, well, then, my dear fellow, you must stop it, somehow.  You’ll know how to do it.”

“I?” said Lanfear, indignantly; but his vexation was not so great that he did not feel a certain pleasure in fulfilling this strangest part of his professional duty, when at the beginning of their next excursion he put Miss Gerald into the victoria with her father and fell back to the point at which he had seen the lieutenant waiting to haunt their farther progress.  He put himself plumply in front of the officer and demanded in very blunt Italian:  “What do you want?”