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Quarterly Journal of Microscopical Science, Vol s3-96, 515-516, Copyright © 1955 by Company of Biologists
1 Cytological Laboratory, Department of Zoology and Comparative Anatomy, Oxford
A simple and accurate method of ensuring axial illumination is described. It involves examining a suitable cardboard disk held in the substage filter-holder and checking that the image of the field-stop is central in the field of view.