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This small microscope has a solid brass base that supports the short tubal pillar. The limb carries the stage, with a dove tail slide underneath, and a body-tube with cone nose. The instrument dates from about 1860, as Nachet moved from Serpente Street in 1862. It is associated with Institut Pasteur, and is similar to the microscope used by Pasteur in his work on the diseases of silkworms. It comes with a wooden carrying case and accessories. Signed: Nachet et Fils rue Serpente, 16. Paris.