I think, that, if required, on pain of death, to name instantly the most perfect thing in the universe, I should risk my fate on a bird's egg. There is, first, its exquisite fragility of material, strong only by the mathematical precision of that form so daintily moulded. There is its absolute purity from external stain, since that thin barrier remains impassable until the whole is in ruins,--a purity recognized in the household proverb of "An apple, an egg, and a nut." Then, its range of tints, so varied, so subdued, and so beautiful,--whether of pure white, like the Martin's, or pure green, like the Robin's, or dotted and mottled into the loveliest of browns, like the Red Thrush's, or aqua-marine, with stains of moss-agate, like the Chipping-Sparrow's, or blotched with long weird ink-marks on a pale ground, like the Oriole's, as if it bore inscribed some magic clue to the bird's darting flight and pensile nest. Above all, the associations and predictions of this little wonder,--that one may bear home between his fingers all that winged splendor, all that celestial melody, coiled in mystery within these tiny walls! Even the chrysalis is less amazing, for its form always preserves some trace, however fantastic, of the perfect insect, and it is but moulting a skin; but this egg appears to the eye like a separate unit from some other kingdom of Nature, claiming more kindred with the very stones than with feathery existence; and it is as if a pearl opened and an angel sang. The nest which is to contain these fair things is a wondrous study also, from the coarse masonry of the Robin to the soft structure of the Humming-Bird, a baby-house among nests. Among all created things, the birds come nearest to man in their domesticity. Their unions are usually in pairs, and for life; and with them, unlike the practice of most quadrupeds, the male labors for the young. He chooses the locality of the nest, aids in its construction, and fights for it, if needful. He sometimes assists in hatching the eggs. He feeds the brood with exhausting labor, like yonder Robin, whose winged picturesque day is spent in putting worms into insatiable beaks, at the rate of one morsel in every three minutes. He has to teach them to fly, as among the Swallows, or even to hunt, as among the Hawks. His life is anchored to his home. Yonder Oriole fills with light and melody the thousand branches of a neighborhood; and yet the centre for all this divergent splendor is always that one drooping dome upon one chosen tree. This he helped to build in May, confiscating cotton as if he were a Union provost-martial, and singing many songs, with his mouth full of plunder; and there he watches over his household, all through the leafy June, perched often upon the airy cradle-edge, and swaying with it in the summer wind. And from this deep nest, after the pretty eggs are hatched, will he and his mate extract every fragment of the shell, leaving it,