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Immersion of tissue in aqueous uranyl acetate be-for giving some degree of contrast to components fore embedding is commonly practiced to increase such as membranes when they extend through the the contrast on sections which are subsequently thickness of the section parallel to the electron stained (2, 3, 5). The treatment is only satisfactory beam. A simple modification of current practice 540

A ROUTINE METHOD FOR OBTAINING HIGH CONTRAST WITHOUT STAINING SECTIONS