And now Tenebris shifted his baleful glare from the advancing dog to the howling man. The dog could wait. The bull's immediate pleasure and purpose were to kill the man. He lowered his head again. But before he could launch his enormous bulk into full motion—before he could shut his eyes—the dog was between him and his quarry. In one spring Lad was at the bull's nose. And again his white eye teeth slashed the ragged nostrils. Tenebris halted his own incipient rush and strove to pin the collie to the ground. It would have been as easy to pin a whizzing hornet. Tenebris thrust at the clinging dog, once more seeking to smash Lad against the sod with his battering-ram forehead and his short horns. But Lad was not there. Instead, he was to the left, his body clean out of danger, his teeth in

