http://gen.lib.rus.ec/book/index.php?md5=12366054e5dbda4f74e8f09558254758
jeremy narby - cosmic serpent
nice descriptions of ayahuasca hallucinations and currents in anthropology (structuralism, poststructuralism, eliade).
the truly /x/-fringe part comes when the author argues that that shamans can communicate with nature by modifying their perception with hallucinogen drugs and establishing contact with plants or animals, enabled by DNA. he believes that DNA was put on earth by some kind of demiurge and that this is more probable than panspermia hypothesis.