Machen, Arthur: The White People, v.1, 7 January 2009.
 

Arthur Machen (1863–1947)
The White People
Written, 1899
Published, 1904


A very spooky short story, admired by Lovecraft..

From Wikipedia:
A discussion of two men on the nature of Evil leads one of them to reveal a mysterious Green Book he possesses. It is a young girl's diary which outlines in strange and evocative writing her day to day life, and conversations with her nurse. Her book makes curious allusions to nymphs," Dols," voolas," "white, green, and scarlet ceremonies," "Aklo letters," the "Xu" and "Chian" languages, "Mao games," and an (actual) game called "Troy Town".among other things. The girl's tale gradually develops a mounting atmosphere of suspense with suggestions of witchcraft.
Some of the strange words and names are actual occult terms, but most were invented by Machen for the story; some were picked up by other authors of the weird in later years, notably Aklo which was used by Lovecraft in connection with the "Sabaoth" invocation in The Dunwich Horror.
http://en.wikipedia.org/wiki/The_White_People