"My heart will tell me," he cried aloud, and loosened the reins of his horse and of his passions. The very semblance of humanity seemed to be suddenly obliterated from his countenance. This was no longer a man, but an agent of destruction rushing like a missile projected from a cannon. There were only two things present to his consciousness--the carriage upon which he was swiftly gaining, and the fierce smiting of the horse's hoofs which seemed to be echoing the cries of his heart for vengeance. On he swept, nearer, nearer, nearer. He was now within hailing distance, and his brain reeled; he forgot his discretion and his plan. "Halt," he screamed, in a voice that cut the silent air like a knife. A face appeared above the top of the buggy, and looked back. It was his foe. With a howl of rage, he snatched a pistol from the holster and fired. The bullet went wide of the mark and the next instant he saw the whip-lash cut the air and descend on the flank of the startled mare. The buggy lurched forward, and for an instant drew rapidly away. Overwhelmed by the fear that he might be baffled in his vengeance, he drew the other pistol and fired again more wide of the mark than before. With a wild oath he flung the smoking weapons into the road, and again drove the spurs into the steaming sides of his horse. There could be no doubt as to the result of the chase after that. The half-maddened animal was overhauling the fugitives perceptibly at every enormous stride, and in a few moments more shot by the buggy and up to the head of the terrified mare. As he did so, his rider reached out his left hand and caught the mare by her bridle, reined up his own horse and threw both of the animals back upon their haunches. In another instant the two men stood confronting each other on the road, the quack black and terrible, the Quaker white and calm. Not a word was spoken, and like two wild beasts emerging from a jungle they sprang at each other's throats. They were oddly, but not unequally, matched, for while the doctor was short, thick-set and muscular, but clumsy and awkward like a bear, David was tall and slim, but lithe and sinewy as a panther. Locked in each other's arms, they seemed like a single hideous monster in some sort of convulsion. As it was impossible for them in this deadly embrace to strike, they wrestled rather than fought, and bit with teeth and tore with hands with equal ferocity. At the instant when the two infuriated men seized each other in this deadly grip, Pepeeta fainted, while the terrified mare backed the buggy into the bushes by the roadside. Romeo, snorting and pawing the ground, approached the combatants, snuffed at them a moment as if profoundly concerned at their strange maneuvers, then, turning away, began to crop the rich blue grass in entire indifference to the results of this mad quarrel between two foolish men.