In this research, which was made with the photoglottographic method, the possibility was examined that a juncture might influence the glottal movements. No such influence was found which might be exclusively attributed to the presence of a juncture. However, the careful examination of the glottograms shows that the glottal movements cannot be adequately understood solely on the basis of mechanical principles. There must be some other underlying principle and it is argued that this principle be the phoneme.