My path had just crossed a round green circle in the woods where an old charcoal-pit had set its seal forever. Suddenly a brown bird flew up from beside the road a few yards ahead of me. If she had kept quiet, I never would have learned her secret. When, however, she came back, flying from branch to branch with fluttering wings and jerking tail, keeping up at the same time a rattle of alarm-notes like a tiny machine-gun, even a novice like myself would suspect a nest. Fortunately a broken hazel bush marked the exact spot from which she had flown. On going there, and looking carefully near its base, I found what has always seemed to me one of the most beautifully hidden nests of all the hundreds which I have seen since--perhaps because it was my first rare nest. It was roofed in by the split hazel-branch, and made of woven dry grass and leaves, with a scanty lining of horse-hair and a flooring of leaf-fragments. Inside were five eggs. Four of them were bluish-white, with aureoles of reddish-brown blotches around the blunt ends; but the fifth was larger, and was specked and splashed with blotches of rufous and brown-purple. Long afterwards I learned that this last egg was the fatal gift of that vampire the cow-bird, and that by leaving it there I had doomed the four legitimate future birds of that nest to certain death. Sooner or later the deadly changeling would hatch from that egg and roll its foster-brothers out of the nest to starve. That day, however, I was ignorant even of the name of the bird whose nest I had found. For long I stood and gloated like a miser over the little jewel-casket which the mother-bird had shown me, and for the first time realized that anywhere in the woods and fields I might come upon other treasure-hordes of the same kind. Then and there I became a treasure-hunter. Ever since then I leave my treasures where I find them, so that my recollections of them may not be marred by any memories of fluttering, mourning mother birds. Aside from any sentimental reasons, it has always seemed to me that he who takes the eggs which he has discovered is guilty of the economic error of spending his principal. If left undisturbed, the nest will pay dividends in the way of information and observations which are worth more than the mere possession of the pierced and empty eggs.