Never say you know the last words about any human heart! I was once treated to a revelation which startled and touched me in the nature of a person with whom I had been acquainted-well, as I supposed-for years, whose character I had had good reasons, heaven knows, to appreciate and in regard to whom I flattered myself I had nothing more to learn.It was on the terrace of the Kursaal at Homburg, nearly ten years ago, one beautiful night toward the end of July. I had come to the place that day from Frankfort, with vague intentions, and was mainly occupied in waiting for my young nephew, the only son of my sister, who had been entrusted to my care by a very fond mother for the summer-I was expected to show him Europe, only the very best of it-and was on his way from Paris to join me.