unusually genial day occurs about the seventh of July, we may hear multitudes of them singing merrily on that occasion. Should this time be followed by two or three successive days of chilly and rainy weather, their tunefulness is so generally brought to a close during this period, that we may not hear another musical note from a single individual after the seventh. The songs of birds are discontinued as soon as their amorous dalliances and the care of their offspring have ceased. Hence those birds that raise but one brood of young during the season, like the bobolink, are the first to become silent.
No one of the New England birds is an autumnal warbler; though the song-sparrow often greets the fine mornings in October with his lays, and the shore-lark, after spending the summer in Labrador and about the shores of Hudson's Bay, is sometimes heard in autumn, soaring and singing at the dawn of day, while on his passage to the South. The bobolink, the veery, or Wilson's thrush, the red thrush, and the golden robin, are silent after the middle of July; the wood-thrush, the cat-bird, and the common robin, not until a month later; but the song-sparrow alone continues to sing throughout the summer. The tuneful season of the year, in New England, embraces a period of about four months, from the middle of April to the middle of August.
There are certain times of the day, as well as certain seasons of the year, when the birds are most musical. The grand concert of the feathered tribe takes place during the hour between dawn and sunrise. During the remainder of the day they sing less in concert, though many species are very musical at noonday, and seem, like the nocturnal birds, to prefer the hour when others are silent. At sunset there is an apparent attempt to unite once more in chorus, but this is far from being so loud or so general as in the morning. The little birds which I have classed in the fourth division are a very important accompaniment to the anthem of dawn, their notes, though short, serving agreeably to fill up the pauses made by the other musicians. Thus, the hair-bird (_Fringilla Socialis_) has a sharp and trilling note, without any modulation, and not at all melodious, when heard alone; but in the morning it is the chief harmonizer of the whole chorus, and serves, more than any other voice, to give unity and symphony to the multitude of miscellaneous parts.
There are not many birds whose notes could be accurately described upon the gamut. The nearest approach we can make to accuracy is to give some general idea of their time and modulation. Their musical intervals can be distinguished but with difficulty, on account of the rapidity of their utterance. I have often attempted to transcribe some of their notes upon the musical scale, but I am persuaded that such sketches can be only approximations to literal correctness. As different individuals of the same species sing very differently, the notes, as transcribed from the song of one individual, will never exactly represent the song of another. If we listen attentively, however, to a number of songs, we shall detect in all of them a _theme_, as it is termed by musicians, of which the different individuals of the species warble their respective variations. Every song is, technically speaking, a _fantasia_ constructed upon this theme, from which none of the species ever departs.
It is very generally believed that the singing-birds are confined to temperate latitudes, and that the tropical birds have not the gift of song. That this is an error is apparent from the testimony of travellers, who speak of the birds in the Sandwich Islands and New Zealand as singing delightfully, and some fine songsters are occasionally imported in cages from tropical climates. The origin of this notion may be explained in several ways. It is worthy of notice that within the tropics the singing season of different species of birds does not occur at the same time. One species may be musical in the spring, another in summer, and others in autumn and winter. When one species, therefore, has begun
