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buildings of any kind for the performance of their sacred rites. A circle of stones (each stone generally of vast size) enclosing an area of from twenty feet to thirty yards in diameter, constituted their sacred place. The most celebrated of these now remaining is Stonehenge, on Salisbury Plain, England.
These sacred circles were generally situated near some stream, or under the shadow of a grove or wide-spreading oak. In the centre of the circle stood the Cromlech or altar, which was a large stone, placed in the manner of a table upon other stones set up on end. The Druids had also their high places, which were large stones or piles of stones on the summits of hills. These were called Cairns, and were used in the worship of the deity under the symbol of the sun.
That the Druids offered sacrifices to their deity there can be no doubt. But there is some uncertainty as to what they offered, and of the ceremonies connected with their religious services we know almost nothing. The classical (Roman) writers affirm that they offered on great occasions human sacrifices; as for success in war or for relief from dangerous diseases. Caesar has given a detailed account of the manner in which this was done. "They have images of immense size, the limbs of which are framed with twisted twigs and filled with living persons. These being set on fire, those within are encompassed by the flames." Many attempts have been made by Celtic writers to shake the testimony of the Roman historians to this fact, but without success.
The Druids observed two festivals in each year. The former took place in the beginning of May, and was called Beltane or "fire of God." On this occasion a large fire was kindled on some elevated spot, in honor of the sun, whose returning beneficence they thus welcomed after the gloom and desolation of winter. Of this custom a trace remains in the name given to Whitsunday in parts of Scotland to this day. Sir Walter Scott uses the word in the Boat Song in the Lady of the Lake:
"Ours is