Every morning on entering the court I called at the nest, and always found five yellow beaks turned to the front. On the third day the heads were covered with slate-colored down; on the fourth, wing-feathers began to show among the heads, but the body was still perfectly bare; on the fifth, the eyes opened on the green world about them,--they were then certainly five days old, and may have been seven; owing to our unfortunate absence at the critical time I cannot be sure. On the seventh day the red-brown of the back began to show, and the white of the breast made itself visible, while the heads began to look feathery instead of fuzzy. Even then, however, they took no notice when I put my finger on them. Long before this time the manner of the parents had changed. In the first place, they were more busy; foraging industriously on the ground, coming within ten or fifteen feet of us, without appearing to see us at all. In fact they had, after the first day, paid no attention to us, for we never had disturbed them, never went to the nest till sure that both were away, and kept still and quiet in our somewhat distant seat. About this time they began to show more anxiety in their manner. The first exhibition was on the fourth day since we knew the young were hatched (and let me say that I _believe_ they were just out of the shell the morning that we found the father feeding). On this fourth day the singer perched near the nest-tree, three or four feet from the ground, and began a very loud wren "dear-r-r-r! dear-r-r-r! dear-r-r-r!" constantly repeated. He jerked himself about with great apparent excitement, looking always on the ground as if he saw an enemy there. We thought it might be a cat we had seen prowling about, but on examination no cat was there. Gradually his tone grew lower and lower, and he calmed down so far as a wren can calm, though he did not cease his cries. I did not know he could be still so long, but I learned more about wren possibilities in that line somewhat later.