During one year from April 1968 to March 1969, I stayed in Eastern Peru to gain insight into the lifestyle of two tribes belonging to the Arwak-language group, the Piro and the Matsigenka. in November and December 1968, I traveled some of the Piro villages located at the Rio Urubamba, including Puiha, where there was an opportunity to attend a ayahuasca session held by some Puiha-based Piro. All these information indicates that the ayahuasca drink in the field of Piro culture can only be understood against the entire background of religious ideas: it enables the shaman to connect closely with the supersensory powers and thus ensures the entire Piro group to communicate with these powers at any time. All these information indicates that the ayahuasca drink in the field of Piro culture can only be understood against the entire background of religious ideas: it enables the shaman to connect closely with the supersensory powers and thus ensures the entire Piro group to communicate with these powers at any time.