TN connection with research into personality determinants of membership in Pentecostal churches, it was attempted to produce glossolalia-the speaking-intongues of Pentecostal groups-in an experimental setting and without any religious suggestion. The results are recorded in a movie which was shown at the Second Annual Conference of the R. M. Bucke Memorial Society, Montreal, in March of 1966, and which can be made available to others studying the phenomenon of glossolalia. A small group of volunteers, some of whom had had some amateur acting experience, succeeded in producing behavior that seems indistinguishable from glossolalia. They achieved this under the influence of the following factors: It was suggested to them that speaking in is possible, and the phenomenon was observed by most of them in Pentecostal churches; an atmosphere was created, through the use of intensely rhythmic drumming, which promoted concentration on the suggestion of glossolalia and protected against distracting stimuli. At the session in which the movie was made, there were six volunteers present, all of whom spoke in tongues to one degree or another; two spoke very clearly. Their reports afterward were similar to reports from Pentecostal speakersin-tongues: they did not know what they had been saying or why; they had had the feeling that the language was produced through them and despite them. The movie was privately shown to a Pentecostal minister, who felt that the portrayed behavior may be called glossolalia, although he attributed it to spiritual sources which were not divine. DOGMATISM AND ORIENTATIONS TOWARD LITURGICAL CHANGE