From his first step of discovering the dandruff, its scarcity or abundance, to his noticing the great diversity existing among cows as to the shape of the bearded ears or quirls, and being convinced these shapes were the signs by which to distinguish cows, and then to make sure that the same mark might always be relied upon as a positive sign of the same perfection or defect; were all steps in the discovery that engrossed his whole mind. He gave up his trade, traveled about, visiting cattle markets, fairs, and stables. Conversing and cross-questioning all whom he could; fixing the results in his mind, and getting the classification shaped out. He talked with farmers, dealers, and veterinary men, ascertained their modes of judging of the points of an animal, and found they were all by their own favorite signs and marks. One looked to the udder, the horns, the hide, or the shape; others to the hair, the veins, or something else; but none judged by the signs which he had found out. All were uncertain. The most the best judges could do would be to guess rightly, perhaps, three times out of five, but none could tell how long a cow would milk. Perfecting his judgment he would visit the same places and the same cows several times in a year, to see how nature was operating upon the animals, and their changes of character in the different periods of gestation, their treatment and food. Of course, he soon began to put his theories to practical value, and he dealt in cattle on his own account. This brought before him cattle from Holland, Switzerland, Brittany, and other countries. This improved his opportunities by proving to him that, no matter what country gave them birth, all individuals possessing the same marks belonged to the same class and the same orders; in short, that nature acted through uniform laws. Imperfections and Tufts. Variations would arise, from crossing two animals with different escutcheons, from some defect in marking at the birth, from lack of development, or from those freaks that nature sometimes plays. They always prove stumbling-blocks in forming the judgment on some animals, and furnish texts to the opponents of the system. As Guenon continued his examinations, he found that his classes did not afford a place for all animals, or rather that there were occasionally to be found cows whose escutcheons while apparently belonging to one of these classes, had at the same time, certain distinguished features which he styled imperfect escutcheons. These Mr. Hazard, the secretary of the commission, described as follows: