"This same nightingale was keeping a little surprise in store for me. Although he took no notice of me sitting at the open window, whenever I went thirty or forty yards from the gate along the narrow lane that faced it, my presence troubled him and his mate only too much. They would flit round my head, emitting the two strongly contrasted sounds with which they express solicitude--the clear, thin, plaintive, or wailing note, and the low, jarring sound--an alternate lamenting and girding. One day ...