_The Aylesbury._ This breed is particularly noted for its deep keel. It differs from the Pekin in type in that it is more nearly level in body. There is a decided tendency for the Aylesbury to run too short in body which has probably come about by extreme selection for deep keel. It is well, therefore, in making the mating to select breeders with good length of body. Since the deep full breast and keel is characteristic of this breed it is necessary to avoid breeders which show any tendency toward a flat breast. As in the case of the Pekins avoid any birds which have green or olive colored bills. The back line of the Aylesbury should be straight, showing no tendency toward a slight concavity as in the Pekin. Birds showing this shape back should be avoided. As in the Pekin black on the bill or bean of the drake will disqualify and in the duck is a serious defect. The color of plumage should be white throughout and should show no tendency toward creaminess. The bill in this breed is flesh colored instead of yellow as in the Pekin. The Aylesbury is not quite as nervous a breed as the Pekin. _The Rouen._ The Rouen duck is a parti-colored breed and is therefore much more difficult to secure in perfection of color and marking than is the case with the white breeds. Moreover, the dark pin feathers make the ducks more difficult to dress than in white breeds. In type these birds are very level in body and are massive, carrying a great deal of meat. Avoid birds showing a lack of length of body or depth of keel or which are too flat in breast. The back of the Rouen should have a slightly convex or arched shape from neck to tail and it is necessary to guard against birds which have a flat or a concave back. The body of the Rouen should be carried practically horizontal. The upper line of the bill should be slightly dished or concave. The white ring about the neck of the drake is an important part of the marking. This should not be too wide but should run about a quarter of an inch in width. It should be as distinct and clean cut as possible but should not quite come together in the rear. Any approach to a ring in the female is a disqualification. White in the primary or secondary wing feathers is a serious defect since it constitutes a disqualification. It must therefore be carefully avoided. White feathers in the fluff of the drake is another color defect which must be guarded against.