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18 brown-dun colour, there being not the slightest approach to a lighter collar, or any lightness elsewhere, except, as in every bird, without exception, on the quill feathers of the wings as seen in flight.

(7) In another bird the breast and ventral surface is of a delicate silvery cream, or creamy silver, something like that on the same parts of the Great Crested Grebe. On the sides of the neck, and just below the chin it is the same, perhaps a little less silvered; but between these two spaces, and so between the chin and breast, a zone of faint brown or dun, somewhat broken and cloudy, pushes itself forward from the wings, thus breaking the continuity of the light surface by the strengthening of a tendency which is, perhaps, just traceable even in the lightest specimens. Besides this, a similar clouded space is continued downwards from the back of the head, first in a diminishing quantity, and then, again, broadening out, till it joins the upper body-colour. So that here only a little of the nape is white, hardly more than what may still be described as the two sides of the neck. This is a very pretty and delicate combination.

(8) Close beside this last bird (No. 7) is a uniformly dark brown one; and

(9) Not far off, on the other side of it, one which exhibits the same sort of general effect, in a dark, smoky dun. This latter bird would generally pass as representing the dark form, and, with fluctuations in either direction, dark or light, it does represent the common form. Nevertheless, it is