Now as these gnatcatchers had the bad taste to dress so nearly alike that I could not tell them apart, I was left to my own surmises as to which took the material. Still, who could it have been but Mrs. Gnat? Would she give over the house to Mr. Gnat at this critical moment? She doubtless wanted to decorate as she went along, and men aren't supposed to know anything about such trivial matters! On the other hand, it might easily be he, for, supposing he had come of a family of superior builders, surely he would want to see to the laying of substantial walls; and unquestionably a good wall was the important part of this nest. Alas! it was a clear case of "The Lady or the Tiger." To complicate matters, the birds worked so fast, so high over my head, and so hidden by the leaves, that I had much ado to keep track of their exchanges at all. If I could only catch them and tie a pink ribbon around one of their necks!—then, at least, I would know which was doing what, or if it was doing what it hadn't done before! It is inconsiderate enough of birds to wear the same kind of clothes, but to talk alike too, when hidden by the leaves—that, indeed, is a straw to break the camel's back. If small gray gnatcatchers up in the treetops had only been big black magpies low in the brush, my testimony regarding their performances might be of more value; but then, the magpies of my acquaintance were so shy they would have none of me; so although life and field work are full of disappointments, they are also full of compensations.

Not being able to do anything better with the gnat problems, I guessed at which was which—when I saw No. 2 go to the nest and No. 1 reluctantly make way as if not wanting No. 2 to meddle, I drew my own conclusions, although they were not scientifically final. I did see one thing that was satisfactory, as far as it went. One of the birds came with big tufts of stiff moss sticking out from either side of its bill like great mustachios, and going up to the nest, handed them to its mate—actually something big enough for a person to see, once! Whatever had been the birds' first feeling as to which should put the bricks in the wall, it was all settled now, and the little helpmate flew off singing out such a happy good-by it made one feel like writing a sermon on the moral effect of renunciation. After that I was sure the little helper fed his (?) mate on the nest, again singing out good-by as he flitted away. Once when he (?) brought material he found her (?) busy with what she had, and so went to the other end of the branch, and waited till she was ready for it, when he flew back and gave it to her.

It was a real delight to watch the little blue-grays at their work. Once as one of them started to fly away—I am sure this was she—she suddenly stopped to look back at the nest as if to think what she wanted to get next; or, perhaps, just to get the effect of her work at a distance, as an artist walks away from his painting; or as any mother bird would stop to admire the pretty nest that was to hold her little brood. Another time one of the gnats,—I was sure this was he,—having driven off an enemy, flipped his tail by the nest with a paternal air of satisfaction. The birds made one especially pretty picture; the little pair stood facing each other close to the nest, and the sun, filtering through the green leaves over their heads, touched them gently as they lingered near their home.

One morning when a gnat was in the nest a leaf blew down past it, startling it so it hopped out in such a hurry that the first I knew it was seated beneath the nest, flashing its tail.

Back and forth the dainty pair flew across the space of blue sky between the oak and the brush. They went so fast and carried so little it seemed as if they might have made their heads save their heels—they brought so little I couldn't see that they brought anything; but I feel delicate about telling what I know about nest-making, and it may be that this was just the secret of the wonderfully compact solid walls of the nest; a little at a time, and that drilled in to stay.

When one of the small builders flew down near me—within two yards—for material, I felt greatly pleased and flattered. Her mate warned her, but she paid no particular attention to him, and with jaunty twists and turns hopped about on the dead limbs, giving hurried jabs at the cobwebs she was gathering. Once she rubbed her little cheek against a twig as if a thread of the cobweb had gotten in her eye. She dashed in among the dead leaves after something, but flew back with a start as if she had seen a ghost. She was not to be daunted, however, and after whipping her tail and peering in for a moment, hopped bravely down again. Sometimes, when collecting cobweb, the gnat would whip its tail and snap its bill snip, snip, snip, as if cutting the web with a pair of scissors.

I was amused one day by seeing a gnat fly down from the oak to the brush with what looked like a long brown caterpillar. The worm dangling from the tip of his beak was almost as large as the bird, and the little fellow had to crook his tail to keep from being overbalanced and going on his bill to the ground.

As the nest went up, the leaves hid it; but I could still see the small wings and tails flip up in the air over the edge of the cup and jerk about as the bird moulded. I watched the workers so long that I felt quite competent to build a nest myself, till happening to remember that it required gnatcatcher tools.

Ornithologists are discouraging people to wait for, and Mountain Billy got so restless under the gnat tree that he had to invent a new fly-brush for himself. On one side of the oak the branches hung low to the ground, and he pushed into the tangle till the green boughs rested on his back and he was almost hidden from view. Meanwhile I sat close beside the chaparral wall, where all sorts of sounds were to be heard, suggestive of the industries of the population hidden within the brush at my back. Hearing small footsteps, I peered in through the brown twigs, and to my delight saw a pair of stately quail walking over the ground, promenading through the brush avenues. Afterwards I caught sight of a gray animal, probably a wood rat, running down a branch behind me, and heard queer muffled sounds of gnawing.

Suddenly, looking back, I was startled to see a big ringed brown and yellow snake lying like a rope at the foot of the gnat's tree, just where I had sat. He was about four feet long, and had twenty-three rings. He started to wind into the crotch of the oak as if meaning to climb the tree, but instead, crept to a stump and festooned himself about it worming around the holes as he might do if looking for nest holes. Imagine how a mother bird would feel to have him come stealing upon her little brood in that horrid way! When he crawled over the dead leaves I noted with a shiver that he made no sound. Thinking of the gnats, I watched his every movement till he had left the premises and wormed his way off through the brush. Though quite engrossed with the gnats, it was finally forced upon me that there is more than one family in the world. The blue-gray's oak was a favored one. A pair of hang-birds had built there before the gnats came, and now two more families had come, making four for the big oak.