a method of processing specimens including securing the specimens to a plurality of slide members and providing a rack member having separators defining a plurality of slide receiving slots . introducing the slides into the slots and immersing the slides while in the rack member into a bath of photographic emulsion , withdrawing the rack member from the bath and drying the emulsion , exposing the emulsion - covered slides while in the rack and developing the exposed slides . the autoradiography apparatus provides a rack member for holding a multiplicity of specimen - bearing slides with the rack member having a base portion , an upper portion and a connecting portion . the base portion has a plurality of upwardly projecting spaced first separator members defining a series of first slide - receiving slots and the upper portion has a plurality of spaced second separating members defining a series of second slide - receiving slots generally aligned with the first receiving slots . in one embodiment the first separator members project generally upwardly from the base portion and the second separator members project generally laterally inwardly from a peripheral wall of the upper portion .