Having made out with a good thing in "The Teachings of Don Juan: A Yaqui Way of Knowledge," Carlos Castaneda now writes a kind of "Don Juan Revisited" [with "A Separate Reality: Further Conversations with Don Juan"]. There is a certain poignancy in the picture of a raw young anthropologist in his encounter with a wise old man of another culture, and in both books Castaneda has played this for all it is worth, even to his own indignity. But no professional anthropologist who read the first book was ever able to suppose it made any contribution to Yaqui ethnography, and it is even unclear to what degree Don Juan was Yaqui in culture. The Appendix purporting to be "A Structural Analysis" shows an abrupt change of style and was evidently tacked on at the behest of a thesis committee, in order to retrieve otherwise woefully inadequate ethnography...