This is an account of a model psychosis (6) produced by eating the seed of a tropical American plant which is known in Mexico as ololiuqui. It is only quite recently that Schultes (16) has made order from chaos in the matter of the identity of a climbing vine calledRivea corymbosa.I was introduced to ololiuqui by Mr. Leslie LeCron during a visit to Los Angeles in which he showed me Taylor's...