Let me remind you, my illustrious doctor, of the promise you were kind enough to make to young M. Argant of a letter of recommendation for London. I had the honor of mentioning this to you two days ago. He is leaving home tomorrow at ten A.M. I hope to see him this evening and would be delighted to deliver the promised letter. Please accept my regards. I will send for the letter before one o'clock, provided you find the time to write it.