The warble of the babillard (_Curruca garrula_, Brisson) is pretty and lively, but its song is rendered monotonous in the spring and summer by the constant repetition of its loud note of defiance, analogous to the clear lively note with which the blackcap generally concludes: this may be expressed by the monosyllable _see_, repeated nine or ten times in quick succession, and at times very loudly: it is a note, which, though agreeable enough when only heard occasionally, becomes quite tiresome when continually reiterated. This species, however, can warble very sweetly if it please, and, in confinement, during the first months of the year, its song is heard to great advantage in a room; it then rarely repeats its loud _see see see_, and when, at that time, the above-mentioned note is uttered, it forms, indeed, an agreeable variety. The song of the babillard is formed of a number of soft chirping notes, many of which are extremely sweet and musical, and though at times tolerably loud, yet they are generally delivered in a very low tone, scarcely audible at a little distance. The male is almost perpetually singing, erecting his crest and the feathers of his throat in the manner of a white-throat, and, like that species and the furze warbler, he is in constant motion the whole time, throwing himself into a variety of odd gesticulations. The song of this bird is very superior to that of many white-throats, but not to all; he has none of those harsh sounding notes which so often disfigure the white-throat's song. He seems also to be always in such high spirits as not to know how to contain himself, taking frequently a long circuitous flight from tree to tree, and back again, a dozen times, seemingly for no other purpose than mere exercise; but he never mounts singing into the air, like the white-throat. There are yet many persons, I believe, who consider this species to be "a mere variety" of the white-throat. These two species differ from each other in size, in make, in colour, in their manners, their habits, their song, in the structure of their nest, and in the marking of their eggs; and surely, "if all these circumstances (as Wilson observes, after making similar remarks on two American birds, one of which had been considered a 'bastard' production of the other) be not sufficient to designate this (the babillard) as a distinct species, by what criterion, I would ask, are we to discriminate between a _variety_ and an _original species_, or, to assure ourselves, that the great horned owl is not, in fact, a _bastard_ goose, or the carrion crow a mere _variety_ of the humming bird?" THE BLACK REDSTART. Motacilla Tithys, LINNÆUS: Le Rouge-queue, BUFFON; Der Wistling, BECHSTEIN.