The result of this selection of breeding stock appears in the extent to which the progeny are inbred to Jack. Of the hundred and twenty-five mares, fifty are sired by Jack, his sons, and grandsons, out of dams similarly sired; while forty are sired by Jack and his three sons, out of mares sired by them. Of the four hundred and ninety foals entered, two hundred and eighty-two are sired by Jack and his sons and grandsons, out of mares by the same list of sires. Of the fifty-one mares not bred from Jack and his direct descendants, twelve were daughters of Prince of Thule (36), and thirty-six by his son Oman. Prince of Thule is thus, next to Jack and his sons, the most important sire element in the stud. His influence, however, is considerably reduced by the almost exclusive extent to which he was mated with mares sired by Jack and his sons. Of the twelve mares sired by him, seven are from daughters of Jack, one from a daughter of Odin, and one from a daughter of Laird of Noss; while twenty-four of the dams of his thirty-four foals are daughters of Jack and his three sons. The influence of his son Oman is similarly discounted, five of his six daughters bred from being daughters of Jack’s sons, while twenty-eight of all his thirty-six foals have dams similarly bred. It is probable that the results of an out-cross of this kind upon an inbred stock like that created by the continuous use of Jack and his sons will be slight and transient; and in point of fact the general influence of Prince of Thule upon the Londonderry Stud has not been greater than might have been expected. The singular predominance of the Jack race in the modern pony is illustrated by the showyard results of recent years.