But I need not refer at greater length to these sweet harmonists of Nature, since scarce an ear is so dull, and few hearts are so cold, as not to be charmed and cheered by their unceasing, joyous melodies. It might well be thought that flowers, those "fairy ministers of grace," with their delicately tinted, variegated, perfect hues, that emit, in their sweet, delicious perfumes, what may be called the "breath of heaven," possess in these delightful qualities full enough to instruct and charm mankind. But there is a flower, it seems, that, inviting the aid of the evening zephyr, adds sweet music to its other fascinating beauties. Let the poet Twombly sing of the music-giving-- BLUE HAREBELL. Have ye ever heard in the twilight dim A low, soft strain That ye fancied a distant vesper-hymn, Borne o'er the plain By the zephyrs that rise on perfumed wing, When the sun's last glances are glimmering? Have ye heard that music, with cadence sweet And merry peal, Ring out like the echoes of fairy feet O'er flowers that steal? The source of that whispering strain I'll tell; For I have listened oft To the music faint of the blue harebell In the gloaming soft: 'Tis the gay fairy-folk the peal who ring, At even-time, for their banqueting. And gayly the trembling bells peal out With gentle tongue; While elves and fairies career about 'Mid dance and song. It would be tedious to enumerate and dwell upon all the very numerous music-making agencies of the natural world; and I shall therefore allude only to a few of those not already mentioned. Many have heard the sounds of waterfalls, and know that from them issues a kind of majestic music, which, to be appreciated, must be heard. Musicians of finely-cultivated ears have studied the tones of waterfalls; and two of them, Messrs. A. and E. Heim, say that a mass of falling water gives "The chord of C sharp, and also the non-accordant F. When C and D sound louder than the middle note, F is heard very fully, as a deep, dull, humming, far-resounding tone, with a strength proportionate to the mass of the falling water. It easily penetrates to a distance at which the other notes are inaudible. The notes C, E, G, F, belong to all rushing water, and in great falls are sometimes in different octaves. Small falls give the same notes one or two octaves higher. In the stronger falls, F is heard the most easily; in the weak ones, C. At the first attempt, C is most readily detected. Persons with musical cultivation, on attempting to sing near rapidly-moving water, naturally use the key of C sharp, or of F sharp if near a great fall."