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Perhaps the most important object in nature to the early Celts as to most primitive folk was the moon.  The phases of the moon were apparent before men observed the solstices and equinoxes, and they formed an easy method of measuring time.  The Celtic year was at first lunar—­Pliny speaks of the Celtic method of counting the beginning of months and years by the moon—­and night was supposed to precede day.[574] The festivals of growth began, not at sunrise, but on the previous evening with the rising of the moon, and the name La Lunade is still given to the Midsummer festival in parts of France.[575] At Vallon de la Suille a wood on the slope where the festival is held is called Bois de la Lune; and in Ireland, where the festival begins on the previous evening, in the district where an ascent of Cnoc Aine is made, the position of the moon must be observed.  A similar combination of sun and moon cults is found in an inscription at Lausanne—­To the genius of the sun and moon.[576]

Possibly sun festivals took the place of those of the moon.  Traces of the connection of the moon with agriculture occur in different regions, the connection being established through the primitive law of sympathetic magic.  The moon waxes and wanes, therefore it must affect all processes of growth or decay.  Dr. Frazer has cited many instances of this belief, and has shown that the moon had a priority to the sun in worship, e.g. in Egypt and Babylon.[577] Sowing is done with a waxing moon, so that, through sympathy, there may be a large increase.  But harvesting, cutting timber, etc., should be done with a waning moon, because moisture being caused by a waxing moon, it was necessary to avoid cutting such things as would spoil by moisture at that time.  Similar beliefs are found among the Celts.  Mistletoe and other magical plants were culled with a waxing moon, probably because their power would thus be greater.  Dr. Johnson noted the fact that the Highlanders sowed their seed with a waxing moon, in the expectation of a better harvest.  For similar occult reasons, it is thought in Brittany that conception during a waxing moon produces a male child, during a waning moon a female, while accouchements at the latter time are dangerous.  Sheep and cows should be killed at the new moon, else their flesh will shrink, but peats should be cut in the last quarter, otherwise they will remain moist and give out “a power of smoke."[578]

These ideas take us back to a time when it was held that the moon was not merely the measurer of time, but had powerful effects on the processes of growth and decay.  Artemis and Diana, moon-goddesses, had power over all growing things, and as some Celtic goddesses were equated with Diana, they may have been connected with the moon, more especially as Gallo-Roman images of Diana have the head adorned with a crescent moon.  In some cases festivals of the moon remained