_Eggs._--The orange-crowned warbler lays from 4 to 6 eggs to a set, probably most often 5. Dr. Brandt (1943) describes his Alaska eggs as follows: "The egg is short ovate in outline, the surface moderately glossy, and the shell delicate. The ground color is white and is prominent because the markings obscure but one-fifth of its area. These spots are very small, and are peppered over the broad end in an ill-defined wreath, while over the smaller two-thirds the egg is almost immaculate. In color the markings range from hydrangea red to ocher red; and underlying these are a few weak spots of deep dull lavender." Probably a series of the eggs would show all the variations shown in eggs of the other races. The measurements of 50 eggs, including those of the Rocky Mountain race, average 16.2 by 12.7 millimeters; the eggs showing the four extremes measure =18.3= by 13.2, 17.0 by =14.2=, and =14.7= by =12.2= millimeters (Harris). _Plumages._--Dr. Dwight (1900) describes the juvenal plumage as "above, brownish olive-green. Wings and tail olive-brown, broadly edged with bright olive-green, the median and greater coverts tipped with buff. Below, greenish buff paler and yellower on abdomen and crissum. Lores and auriculars grayish buff." The first winter plumage is acquired by a postjuvenal molt that involves the contour plumage and the wing coverts but not the rest of the wings or the tail. The sexes are alike in the juvenal plumage and much alike in all plumages, except that the female is always duller; in her first winter plumage the orange crown is lacking, and it is more or less suppressed and sometimes wholly lacking in subsequent plumages. Dr. Dwight (1900) describes the young male in first winter plumage as "above, bright olive-green, mostly concealed on the pileum and nape with pale mouse-gray edgings that blend into the green. The crown brownish orange concealed by greenish feather tips. Wing coverts broadly edged with dull olive-green, sometimes the greater coverts with faint whitish tips. Below, pale olive-yellow, grayish on the chin and sides of neck with very indistinct olive-gray streaking. A dusky anteorbital spot. Lores, orbital ring and indistinct superciliary stripe mouse-gray." The first nuptial plumage is acquired by a partial prenuptial molt, "which involves chiefly the anterior part of the head and the chin. A richer, half concealed, orange crown patch is acquired; the lores and adjacent parts become grayer, the anteorbital spot darker. Wear makes birds greener above and slightly yellower below. Young and old become practically indistinguishable." Subsequent molts consist of a complete postnuptial molt in summer and a partial prenuptial molt in early spring, as described above. The adult winter plumage "differs chiefly from first winter dress in possessing a larger, more distinct crown patch," in the male, and more or less of it in the female. "The color below is uniform and paler."