[The effect which the bonfires are supposed to have in fertilizing cattle and women may also be attributed to an increase of solar heat produced by the fires.]
But in popular belief the quickening and fertilizing influence of the bonfires is not limited to the vegetable world; it extends also to animals. This plainly appears from the Irish custom of driving barren cattle through the midsummer fires,[836] from the French belief that the Yule-log steeped in water helps cows to calve,[837] from the French and Servian notion that there will be as many chickens, calves, lambs, and kids as there are sparks struck out of the Yule log,[838] from the French custom of putting the ashes of the bonfires in the fowls’ nests to make the hens lay eggs,[839] and from the German practice of mixing the ashes of the bonfires with the drink of cattle in order to make the animals thrive.[840] Further, there are clear indications that even human fecundity is supposed to be promoted by the genial heat of the fires. In Morocco the people think that childless couples can obtain offspring by leaping over the midsummer bonfire.[841] It is an Irish belief that a girl who jumps thrice over the midsummer bonfire will soon marry and become the mother of many children;[842] in Flanders women leap over the Midsummer fires to ensure an easy delivery;[843] and in various parts of France they think that if a girl dances round nine fires she will be sure to marry within the year.[844] On the other hand, in Lechrain people say that if a young man and woman, leaping over the midsummer fire together, escape unsmirched, the young woman will not become a mother within twelve months:[845] the flames have not touched and fertilized her. In parts of Switzerland and France the lighting of the