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This study on subliminal registration represents an attempt to verify and extend an observation made by Urbantschitsch in 1907 that a picture covered with sheets of blank, translucent paper so that it is not consciously recognized can nevertheless influence the immediate visual imagery of the subject confronted with the apparently blank stimulus. The Rubin Double Profile line drawing, adequately concealed under layers of translucent paper, and a similar but completely blank control stimulus were presented to twelve volunteer subjects. Visual images that appeared with eyes closed after repeated gazing at the two stimuli were coded and 'blind-scored' by independent judges, utilizing an a priori check list whose reliability had been established in other research studies. The same experiment was carried out with five of the subjects after administration of subhallucinatory doses of LSD in order to test the hypothesis that relatively impaired ego functioning, obtained by chemically induced regression, increases subliminally registered percepts. The results of both experiments indicate that the Urbantschitsch phenomenon is a valid one, and that the regressed ego loses some capacity to bar subliminal stimuli from filtering into consciousness. In addition, the images obtained in the LSD subjects showed interesting differences from those obtained in the main experiment; chiefly an increase in color, light, and inanimate movement, and a decrease in the importance of the shapes of the image objects. It is speculated that these findings indicate the presence of an archaic level of perception, developmentally earlier than that dominated by primary process transformations. On the basis of subliminal registration of visual cues parapsychological data concerning the psi-phenomenon may bear reinterpretation.