We may at once admit that there may often be a very considerable difference between the conformation of the stayer and the sprinter, yet the real difference lies hidden from the sight of the judge, for the difference is in the _particular kind of heart that the animal has inherited_. If my contention as regards the heart be accepted, we then have a simple explanation of the common rule that staying sires produce staying stock. Carbine, for instance, was the prince of stayers, and his son, Wallace, gave us Trafalgar and innumerable other stayers. Positano was a stayer, and he gave us four Melbourne Cup winners. Maltster, on the other hand, was an indifferent stayer, and while he was one of the most successful sires in the whole world, he gave us only one stayer, Alawa. Some of his sons and daughters could just get a mile and a half—Malt King and Maltine were both Metropolitan winners, but they could go no further. Thus it is brought home to us that though a sire may be the father of hundreds of brilliant milers, it is reserved for a few horses to beget stayers of two miles or more. Nothing could show this better than a study of the progeny of Grafton and Linacre. These sires have been the fathers of hundreds of horses that have won races up to a mile, and yet we look in vain for long-distance horses from either. True it is that Peru won an Australian Cup, and that Lingle and Erasmus both ran second in the Melbourne Cup, but three swallows don’t make a spring. Let us then recognise this fact, that just as a man may transmit his nose, his eyes or his ears to his sons and daughters, just so may a horse transmit his bone, his muscle, his colour and his _heart_ to his sons and daughters. So now we come to the secret: It matters not whether a horse is black or brown or chestnut—the essential thing the animal has to possess in order that he may stay is a _staying heart_. Now, the first objection that will be put forward to this proposition is that every now and then a true stayer arises from a non-staying sire—I admit this is true. I have already mentioned that Alawa was a son of Maltster; Lingle a son of Linacre, Peru from Grafton, while Eurythmic, the most wonderful horse at present racing, who won a Sydney Cup carrying 9.8 on his back, with a run that will for ever make him famous, had for a sire Eudorus, a brilliant horse for a mile, especially when that mile was in the mud!