“My own attention was called to Guenon’s method of judging cows some eight or ten years ago, and since that time I have examined many hundreds, with a view to ascertain the correctness of its main features, inquiring, at the same time, after the views and opinions of the best breeders and judges of stock, with regard to their experience and judgment of its merits; and the result of my observations has been that cows with the most perfectly developed milk-mirrors or escutcheons are, with rare exceptions, the best milkers of their breed, and that cows with small and slightly developed mirrors are, in the majority of cases, bad milkers. “I say the best milkers of _their breed_, for I do not believe that precisely the same sized and formed milk-mirrors on a Hereford, or a Devon and an Ayrshire, or a native, will indicate anything like the same or equal milking properties. It will not do, in my opinion, to disregard the general and well-known characteristics of the breed, and rely wholly on the milk-mirror; but I think it may be safely said that, as a general rule, the best marked Hereford will turn out to be the best milker among the Herefords, all of which are poor milkers; the best marked Devon, the best among the Devons; and the best marked Ayrshire, the best among the Ayrshires; that is, it will not do to compare two animals of entirely distinct breeds by the milk-mirrors alone, without regard to the fixed habits and education, so to speak, of the breed or family to which they belong.” “In my own herd of Ayrshire cows, the largest milkers have the best escutcheons, and these cows have, in most cases, transmitted these marks to their descendants. On the other hand, the cows with medium or poor escutcheons have rarely transmitted to their calves better ones; but, generally, of the same or lower class than the dams. “BULLS.—Guenon’s second and hardly less important discovery was that the bull had the same marks as the cow, only somewhat shorter and narrower. Guenon bestows upon these marks the same name, ‘milk-mirror,’ which may be justified, in as far as the bull has greater influence upon the sustaining or obtaining of an abundant yield of milk, as well as the improvement of the breed. “SOME TESTIMONY.—Mr. L. A. Hansen, of Bay St. Louis, writes, in a letter to the _Country Gentleman_: