The Percheron breed is old enough, is propagated with sufficient uniformity, and presents sufficiently marked typical qualities to authorize us in claiming, in favor of its members, the characteristics and the title of a separate and distinct breed. Consequently, a Stud-book, recording its pedigrees, would not be out of place. This book would have the effect of concentrating the efforts of all the breeders, giving them a definite direction, and at the same time it would designate stallions foreign to the race, and which, up to the present time, have been presented with impunity as Percherons. England exhibits a curious example of the influence of the Stud-book in the improvement of a breed. The equine and bovine races of that country, before the establishment of the Stud and Herd-books, were but rudimental. The small number of colts of the Royal mares by Eastern stallions would have been lost had they not been classed together in families in a special book. The discovery of the value of the bull _Hubback_ would have been to no purpose had his descendants not been classified by themselves in an authentic manner. For it is especially, and only, in the reproduction by family that a breed is formed. Consanguinity alone can form, in the beginning, a bond of cohesion and connection among the descendants of the primitive families. By it, alone, they acquire that great similarity of shape and adaptation to particular ends, that great ancestral power, which they transmit to their posterity, and which, even in a commercial point of view, gives them a superior value. If it be permitted me for this purpose to select an example within our reach among the bovine races, I would say that, in Nivernais the celebrated Charollaise breed of cattle, only a few years ago, was diffuse, without uniformity, and without commercial value. The idea of classifying it by means of a Herd-book was no sooner put in practice than good crossings, being all made with system, no longer lost their significance. The breed has visibly improved, and, at present, it has acquired a value which gives it a rank immediately after the Cotentin. The Stud-book might be established, as we have indicated above, by inscribing therein all the stallions and mares which had received prizes for years back, continuing this operation for a dozen years to come, and adding therein also the animals which had not taken prizes or had not been shown in the fairs, but which public attention had classed among the number of types valuable on account of the beauty and sureness of their reproduction.