Word: infusoria
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Dates: during 1940-1949
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...among the Animalcules. Less than 1/125th of an inch long and shaped like the sole of a lady's slipper, Paramecium bursaria or the slipper animalcule is a comparatively large member of the class Infusoria-a family of hairy, one-celled animals that swarm in lily ponds, goldfish bowls, and even in water glasses on the best dining tables. Paramecium, because of its size and fecundity (two generations a day), is a favorite subject for the study of unicellular life. Dr. Jennings, whose private laboratory is cluttered with his favorite "critters," believes they also provide important keys...
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