The names indicate as much. Hjuki, in Norse, would be pronounced Juki, which would readily become Jack; and Bil, for the sake of euphony, and in order to give a female name to one of the children, would become Jill.
The fall of Jack, and the subsequent fall of Jill, simply represent the vanishing of one moon-spot after another, as the moon wanes.
But the old Norse myth had a deeper signification than merely an explanation of the moon-spots.
Hjuki is derived from the verb jakka, to heap or pile together, to assemble and increase; and Bil from bila, to break up or dissolve. Hjuki and Bil, therefore, signify nothing more than the waxing and waning of the moon, and the water they are represented as bearing signifies the fact that the rainfall depends on the phases of the moon. Waxing and waning were individualized, and the meteorological fact of the connection of the rain with the moon was represented by the children as water-bearers.
But though Jack and Jill became by degrees dissevered in the popular mind from the moon, the original myth went through a fresh phase, and exists still under a new form. The Norse superstition attributed theft to the moon and the vulgar
