By the water at Wismar most knavishly did Owlglass beguile a horse-dealer. For unto that place came a horse-dealer, and he bought no horse unless by a certain thing he learned whether the horse was long to live. And thus did he: when that he had bargained and the price was fixed, he seized the horse by the tail, and marked, by the plucking of the tail, whether he would long live or no. For if the horse had a long tail, and he plucked him thereby, and the hair was weak, then judged he the horse would not long live. Then bought he not that horse. An if the tail were firm in the horse, then did he buy it, and believed truly that it would long live and had a hardy body. For this was a common saying at Wismar, and in it believed all people which abode there. Of this saying heard Owlglass, and upon it meditated he a great knavery; for he held it to be a thing most grave, that all error should from the folk be taken, for Owlglass would have no beguiler of the people but himself; and, my masters, was not this our good master an exemplar unto many which even unto this day have followed in his footsteps?

In the black art was our master also well grounded; therefore with rosin and blood made he a tail unto a horse, the which had no tail, and therewith gat he him to market, and there did he bid to the folk dear enough so that none would buy it. And the merchant, which plucked the horses by the tail, after that came by, and Owlglass offered it unto him at cheap rate, in all good conscience. Then the merchant looked upon the horse that it was fair, and in truth worth the money which Owlglass demanded therefor. So he came thither, and desired to pluck it by the tail. Now Owlglass had so wrought the tail, that if peradventure the dealer so plucked, the tail would therewith stay within his hand, and it should seem as if he had plucked it forth. And so also it came to pass. Then stood the merchant with the tail, and was abashed; and Owlglass cried with a loud voice: “Behold the knave, he hath plucked my horse by the tail, and lo! he hath plucked it out, and my horse hath he marred.” Then ran the townsfolk, and held the merchant, and would not let him depart until that he had satisfied Owlglass with ten crowns for the damage unto the horse. Then Owlglass went on his way rejoicing.