on the approach of summer that he drives his cattle out into the open to crop the fresh grass, and it is on the approach of winter that he leads them back to the safety and shelter of the stall. Accordingly it seems not improbable that the Celtic bisection of the year into two halves at the beginning of May and the beginning of November dates from a time when the Celts were mainly a pastoral people, dependent for their subsistence on their herds, and when accordingly the great epochs of the year for them were the days on which the cattle went forth from the homestead in early summer and returned to it again in early winter.[567] Even in Central Europe, remote from the region now occupied by the Celts, a similar bisection of the year may be clearly traced in the great popularity, on the one hand, of May Day and its Eve (Walpurgis Night), and, on the other hand, of the Feast of All Souls at the beginning of November, which under a thin Christian cloak conceals an ancient pagan festival of the dead.[568] Hence we may conjecture that everywhere throughout Europe the celestial division of the year according to the solstices was preceded by what we may call a terrestrial division of the year according to the beginning of summer and the beginning of winter. [The two great Celtic festivals, Beltane and Hallowe'en.] Be that as it may, the two great Celtic festivals of May Day and the first of November or, to be more accurate, the Eves of these two days, closely resemble each other in the manner of their celebration and in the superstitions associated with them, and alike, by the antique character impressed upon both, betray a remote and purely pagan origin. The festival of May Day or Beltane, as the Celts called it, which ushered in summer, has already been described;[569] it remains to give some account of the corresponding festival of Hallowe'en, which announced the arrival of winter. [Hallowe'en (the evening of October 31st) seems to have marked the beginning of the Celtic year; the many forms of divination resorted to at Hallowe'en are appropriate to the beginning of a New Year; Hallowe'en also a festival of the dead.]