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Abstract
A transparent tissue is illuminated with a narrow slit of light which is formed by light transmitted down one-half of a microscope objective, and the tissue is observed through the other half. The tissue is moved slowly across the light, and a photographic film is moved at a corresponding rate over a parfocal slit at the eyepiece level. In this way, thin optical sections are reproduced on the film, free from light scattered in the bulk of the tissue. Various corneal layers are illustrated, and a system of alternating light and dark zones in the stroma are revealed.