"She obsairved that she might repeat her veesit later," replied Mrs. M'Gregor, and, after a moment's hesitation; "she awaited ye're return with exemplary patience." "Really, I am sorry I was detained," declared Stuart, replacing his boot. "How long has she been gone, then?" "Just the now. No more than two or three minutes. I trust she is no worse." "Worse!" "The lass seemed o'er anxious to see you." "Well, you know, Mrs. M'Gregor, she comes a considerable distance." "So I am given to understand, Mr. Keppel," replied the old lady; "and in a grand luxurious car." Stuart assumed an expression of perplexity to hide his embarrassment. "Mrs. M'Gregor," he said rather ruefully, "you watch over me as tenderly as my own mother would have done. I have observed a certain restraint in your manner whenever you have had occasion to refer to Mlle. Dorian. In what way does she differ from my other lady patients?" And even as he spoke the words he knew in his heart that she differed from every other woman in the world. Mrs. M'Gregor sniffed. "Do your other lady patients wear furs that your airnings for six months could never pay for, Mr. Keppel?" she inquired. "No, unfortunately they pin their faith, for the most part, to gaily coloured shawls. All the more reason why I should bless the accident which led Mlle. Dorian to my door." Mrs. M'Gregor, betraying, in her interest, real suspicion, murmured _sotto voce_: "Then she _is_ a patient?" "What's that?" asked Stuart, regarding her surprisedly. "A patient? Certainly. She suffers from insomnia." "I'm no' surprised to hear it." "What do you mean, Mrs. M'Gregor?" "Now, Mr. Keppel, laddie, ye're angry with me, and like enough I am a meddlesome auld woman. But I know what a man will do for shining een and a winsome face--nane better to my sorrow--and twa times have I heard the Warning." Stuart stood up in real perplexity. "Pardon my density, Mrs. M'Gregor, but--er--the Warning? To what 'warning' do you refer?" Seating herself in the chair before the writing-table, Mrs. M'Gregor shook her head pensively. "What would it be," she said softly, "but the Pibroch o' the M'Gregors?" Stuart came across and leaned upon a corner of the table. "The Pibroch of the M'Gregors?" he repeated. "Nane other. 'Tis said to be Rob Roy's ain piper that gives warning when danger threatens ane o' the M'Gregors or any they love." Stuart restrained a smile, and, "A well-meaning but melancholy retainer!" he commented. "As well as I hear you now, laddie, I heard the pibroch on the day a certain woman first crossed my threshold, nigh thirty years ago, in Inverary. And as plainly as I heard it wailing then, I heard it the first evening that Miss Dorian came to this house!" Torn between good-humoured amusement and real interest, "If I remember rightly," said Stuart, "Mlle. Dorian first called here just a week ago, and immediately before I returned from an Infirmary case?" "Your memory is guid, Mr. Keppel."