Though jostled most readily by the winds, and in danger of destruction, yet, by a wise provision of instinct, their contents are insured against accident. This is prevented not so much by the depth of the cavity, as by the purse-like contraction of the rim.
Few structures of bird-architecture are more handsome than the home of this little Gnatcatcher, and none so worthily excite our wonder and admiration. Like the nests of the Humming-bird and Wood Pewee, it is a perfect model of beauty and design. So cunningly contrived a structure, and one so comfortably, durably and tastefully arranged, would doubtless be attributed by us to the work of superior beings, were we not acquainted with the artificers. In the foregoing particulars, it stands almost unrivalled. Like the colors which glow upon the bosom of the mother of pearl, it must be seen to be fully appreciated. No description, however faithfully portrayed, can give an adequate conception of its beauty. But we shall make the attempt. Even the picture gives but a meagre idea of the elegance of this cosy chamber. Its walls are of felt, closely and compactly woven, and made of slender stems of grass, the down of thistles, spider's webs, and vegetable-like fibres. As if dissatisfied with such a fine piece of mechanism, our little architects must needs go further. With a love for the beautiful and picturesque, they almost startle the beholder by investing the exterior with a fine stucco-work of bluish-gray lichens which serves the two-fold purpose of ornamentation and protection. So like a natural excrescence does the nest now appear, that only the experienced eye can detect the 'difference. Compared with the size of its tiny builder, who measures but four and three-tenths inches from tip of bill to caudal extremity, the nest seems bulky. These structures are, however, by no means uniform in size. A specimen from New Jersey has a width of two and seven-eighths inches, and a height of three. Another from Texas measures two and five-eighths inches in length, and but two and a half in external diameter. The smallest we have seen are from Tennessee and California. The former has a width of two and a quarter inches, and a height of two and five-eighths, while the latter differs therefrom only in length, being half an inch less. The cavities offer less striking differences, varying slightly from one and a half inches in either direction. In composition the Western nest presents some points of difference. The exterior is composed of yellowish-green and greenish-gray lichens, specifically distinct from Eastern specimens, a slight intersprinkling of brown catkins, feathers, cobwebs, and small bits of vegetable stems. The inside does not present much variation, but is lined with feathers, horse-hairs and vegetable wool, as many of our own are. When feathers are utilized for a lining, the quills are generally placed in the walls of the nest, only the soft plume-like parts being allowed to come into contact with the eggs. The nest from California was found by Prof. Ever-mann, in the vicinity of Santa Paula, during the summer of 1881. It is the prettiest, as well as the most elaborately perfected nest which we have yet seen. The one from which the drawing was made, while less artistic, deserves mention, from the peculiar position which it occupies, being wedged in between two diverging branches from a sweet-gum, and fastened thereto by cobwebs passing from its outside to the wing-like expansions of the wood.
Such finished and complicated structures are assuredly not the work of a few hours, but the labor of unwearied perseverance and industry upon the part of the builders for a week. No division of the work is allowed, but each bird toils as suits its inclination. Whether the rearing of the fabric proper with its finely-felted walls, or the laying on of the tiles afterwards, requires the longer time to accomplish, it is difficult to say. Our experience teaches that the latter is the more trying and difficult task, and consumes one-third more time. It must not be presumed that the builders work steadily through the entire day. This is not the case. Rest, recreation, and the procurement of food, are matters that require attention, and prolong the labor.
Having finished their home, the female is not slow in providing it with tenants. From four to six eggs are deposited in as many days, and incubation entered into. This lasts fourteen days, and is as much the work of one sex as the other. While thus occupied, the birds are jealous of their property, and resent all intrusions with a valor worthy of admiration. This is especially the case when their home is visited by the Cowbird. So determined and fierce are the attacks which they wage against these birds, that in the melee which ensues, their fragile home is often entirely destroyed. In Cooke County, Texas, where this Gnatcatcher is abundant, fully half the nests that have been found by Mr. Ragsdale, the narrator of this fact, are despoiled before completion, and, in many instances, completely obliterated. But let the intruder be some conscienceless collector, knowing that resistance is useless the birds do not make a stand, but seek some safe spot where they can observe the proceedings. But as soon as the premises have been deserted they return, and if the home remains untouched, resume possession as though nothing had happened. In the event of desecration, they forsake the spot with sorrow and reluctance, and try their fortunes elsewhere. But a single brood is raised, although the tardiness of some pairs to nidificate has led to the belief that in some seasons the species may be double-brooded.
The young birds, for a week or ten days subsequent to hatching, are quite weak and tender, and but for the attention and care bestowed by parental love, would quickly perish. Endowed by Nature with vigorous appetites, and being blessed with kind and thoughtful parents, they are soon able to help themselves. Their food at first consists of larvæ of various kinds, but chiefly those of a lepidopterous character, and small diptera. With age comes an increase in the quantity and character of their food, and at the age of four weeks they desert the home-shelter, and forage in common with their parents. Thus they spend their lives, careless and happy, until the first appearance of the "sere and yellow leaf" in September warns them of the growing scarcity of food-stuffs, and bids them retire to the groves of our southernmost States, or to scenes beyond the Mexic line.
Their eggs are oval in form, and slightly pointed. In ground-color they are white, and spotted and blotched with reddish-brown, slate and lilac. Cabinet specimens, however, show sometimes a faint bluish- or greenish-white tint. The markings, though varying considerably, are uniformly distributed. In size, there is noticeable but little variation in specimens from diverse localities; eggs from Michigan differing but slightly from those from Texas, and these sustaining the same' relation to sets from Pennsylvania. The average dimensions of a clutch of four from New Jersey are .59 by .48 inches. The depth of the nest precludes us from showing the eggs in situ. We are therefore compelled to give a drawing below, which will be found to be of the natural proportions. The female-bird, which is placed in close contiguity to the nest, may be easily distinguished from her mate, by the absence of black upon the head.
