"These different strains are interspersed with pauses which in all styles of melody concur in producing great effects. We dwell on the beautiful notes we have just heard, and which still resound in our ears; we enjoy them the more because the pleasure is more limited, more exclusive, and undisturbed by new sensations. Soon we expect, we desire another strain; we hope it may be pleasing; if we are mistaken, the beauty of what we hear will not leave us room to regret that which is only delayed, and the interest of hope is maintained for the strains which will follow. One of the reasons why the song of the nightingale is so striking, and produces so much effect, is, as Mr. Barington has well said, because he sings in the night, which is the most favourable time, and he sings alone, whereby his voice is heard in all its splendour, and is undisturbed by any other voice. He eclipses all other birds, adds Mr. Barington, by his soft flute-like tones, and by the uninterrupted duration of his warble, which lasts sometimes for twenty seconds. The same observer reckoned in this warble sixteen different strains, well marked by their first and last notes, the intermediate notes being tastefully varied by the bird; and he ascertained that the space filled by the nightingale's voice is no less than an English mile in diameter, especially when the air is calm: this equals the compass of the human voice. "It is surprising that so small a bird, which weighs only half an ounce, should have such force in the vocal organs. Mr. Hunter has observed that the muscles of the larynx, or gullet, are stronger in proportion, in this species, than in any other, and also stronger in the male which sings, than in the female which does not sing.