"The Black Tarn is full of the great fish," the Enchanted Cow declared. "They have taken refuge there, Ken Water being so low. You have but to stretch your nets, draw them, and reap your harvest." "But, my dear madam," urged Sir Gladys, "the Black Tarn is surrounded by fens and marshes. Our horses were mired in trying to take out boats and nets this spring, when the ice first broke and we thought to fish in the Black Tarn, at a venture." "As I remarked at the beginning of this conversation," said the White Cow, somewhat testily, "it is the split hoof that you need--" Just then the distant Church clocks of the Saag could be heard, all striking the hour of twelve. The White Cow turned at once and walked in the direction of the Black Tarn, and Sir Gladys, the Lady Floretta and the seven maidens, now fully awake, followed, the more speedily because of a screech from the Witch, as she burst from the door, her inevitable yearly nap at an end. But no word could be heard from the Enchanted Cow. She looked meaningly at Sir Gladys, though, and that gallant gentleman seemed plunged in thought as the little party of wanderers left the white figure standing on the edge of the swampy ground which surrounded the Black Tarn. Sir Gladys escorted the Lady Floretta home, and what the two said to each other as they hurried over the moor toward the Moated Grange is what no one need consider. They were companions in misfortune, and so drawn closely. Having bowed to the ground at the Great Gate, and having seen it close on the disappearing forms of the lady and her seven maidens, Sir Gladys hied him home, with quickened step. All the while he was thinking deeply. He had been from boyhood a student of natural history. [Illustration: "SIR GLADYS ESCORTED THE LADY FLORETTA HOME"] Away back in the past so dim and distant that only the most learned can talk of it intelligently, away in the time after the earth had risen from the warm waters and when the great reptiles had given place to animals, something like those which exist to-day, the hoofs of all the quadrupeds were split. The land was low and marshy then, and the split hoof best supported its owner on the yielding surface. As the earth protruded more and more, and dry and sometimes rocky land uprose, such beasts as frequented the hills found that their hoofs were changing slowly with the centuries. Hard and round the hoofs became as was best for the hill dwellers, but the beasts of the shores and lowlands retained the split hoof and still can tread the morass. This the Enchanted Cow knew. This, Sir Gladys Rhinestone, who had studied natural history, knew as well.