In Bohemia only exists the superstition exactly opposite to that elsewhere prevalent, namely, that whoever picks up a horse-shoe thereby _ipso facto_ picks up ill-luck for himself,—a notable example in folk-lore of the exception which proves the rule. The Bohemians, however, believe a nailed-up horse-shoe to be a cure for lunacy.[200] As a general rule, the degree of luck pertaining to a horse-shoe found by chance has been thought to depend on the number of nails remaining in it: the more nails the more luck.[201] In Northumberland the holes free of nails are carefully counted, as these indicate, presumably in years, how soon the finder of the shoe may expect to be married.[202] The peasants of northern Portugal prefer mule-shoes having an uneven number of nail-holes, as counteractives of the evil influences of the dreaded, omnipresent witches known as the _Bruxas_.[203] In Derbyshire it is customary to drive a horse-shoe, prongs upward, between two flagstones near the door of a dwelling.[204] This position is sometimes explained by saying that, so placed, the luck cannot spill out. In a short poem called “The Lucky Horse-Shoe,” by James T. Fields, an amusing account is given of a farmer who picked up an old horse-shoe from the road, and nailed it upon the door of his barn with the prongs downward. But, far from bringing him luck, Fortune thereafter frowned upon him; his hay crop failed, a drought blighted his vegetables, and his hens refused to lay. The good farmer, discouraged and perplexed, confided his woes to the sympathetic ear of an aged wayfarer who chanced to pass by, relating how misfortunes had pursued him since he had fastened up the old horse-shoe. The stranger asked to see the shoe; The farmer brought it into view; But when the old man raised his head, He laughed outright and quickly said: “No wonder skies upon you frown, You’ve nailed the horse-shoe upside down; Just turn it round, and soon you’ll see How you and Fortune will agree.” The farmer profited by the friendly suggestion and reversed his luck-token, whereupon the capricious goddess fairly beamed upon him. His barn was soon filled with hay, his storehouses were packed with the kindly fruits of the earth, while his wife presented him with twins. Farmers may well take heed _how_ they nail up horse-shoes over the doors of their barns. To obtain the best results, it would seem advisable to place a pair of these useful articles on each farm building, one with the points upward, the other reversed; for in this way they may not only hope to win Fortune’s smiles, but also to keep all witches and unfriendly spirits at a respectful distance.