Again, from Machen’s The White People:
So when once everybody had come, there was no door at all for anybody else to pass in by. And when they were all inside, round in a ring, touching each other, some one began to sing in the darkness, and some one else would make a noise like thunder with a thing they had on purpose, and on still nights people would hear the thundering noise far, far away beyond the wild land, and some of them, who thought they knew what it was, used to make a sign on their breasts when they woke up in their beds at dead of night and heard that terrible deep noise, like thunder on the mountains. And the noise and the singing would go on and on for a long time, and the people who were in a ring swayed a little to and fro; and the song was in an old, old language that nobody knows now, and the tune was queer. Nurse said her great-grandmother had known some one who remembered a little of it, when she was quite a little girl, and nurse tried to sing some of it to me, and it was so strange a tune that I turned all cold and my flesh crept as if I had put my hand on something dead. Sometimes it was a man that sang and sometimes it was a woman, and sometimes the one who sang it did it so well that two or three of the people who were there fell to the ground shrieking and tearing with their hands. The singing went on, and the people in the ring kept swaying to and fro for a long time, and at last the moon would rise over a place they called the Tole Deol, and came up and showed them swinging and swaying from side to side, with the sweet thick smoke curling up from the burning coals, and floating in circles all around them. Then they had their supper. A boy and a girl brought it to them; the boy carried a great cup of wine, and the girl carried a cake of bread, and they passed the bread and the wine round and round, but they tasted quite different from common bread and common wine, and changed everybody that tasted them. Then they all rose up and danced, and secret things were brought out of some hiding place, and they played extraordinary games, and danced round and round and round in the moonlight, and sometimes people would suddenly disappear and never be heard of afterwards, and nobody knew what had happened to them. And they drank more of that curious wine, and they made images and worshipped them, and nurse showed me how the images were made one day when we were out for a walk, and we passed by a place where there was a lot of wet clay.