From the woods all about came the songs of birds,--among them the contributions of a couple of birds which I was not then acquainted with: the brain-fever bird and the coppersmith.

The song of the brain-fever demon starts on a low but steadily rising key, and is a spiral twist which augments in intensity and severity with each added spiral, growing sharper and sharper, and more and more painful, more and more agonizing, more and more maddening, intolerable, unendurable, as it bores deeper and deeper and deeper into the listener's brain, until at last the brain fever comes as a relief and the man dies.
I am bringing some of these birds home to America.

They will be a great curiosity there, and it is believed that in our climate they will multiply like rabbits.
The coppersmith bird's note at a certain distance away has the ring of a sledge on granite; at a certain other distance the hammering has a more metallic ring, and you might think that the bird was mending a copper kettle; at another distance it has a more woodeny thump, but it is a thump that is full of energy, and sounds just like starting a bung.

So he is a hard bird to name with a single name; he is a stone-breaker, coppersmith, and bung-starter, and even then he is not completely named, for when he is close by you find that there is a soft, deep, melodious quality in his thump, and for that no satisfying name occurs to you.

You will not mind his other notes, but when he camps near enough for you to hear that one, you presently find that his measured and monotonous repetition of it is beginning to disturb you; next it will weary you, soon it will distress you, and before long each thump will hurt your head; if this goes on, you will lose your mind with the pain and misery of it, and go crazy.