Magnetic control of geotropism in Paramoecium.

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Abstract
Examined the combined effects of gravity and magnetism on geotropism in Paramoecium. Paramoecia were taken from free-sediment water, but with iron suspensions. Experiments were made for ingestion of iron for relatively long, moderate, and brief periods. Results reveal that paramoecia which had ingested iron showed a temporarily increased upward-orienting tendency, which persisted as long as the particles remained in the posterior end, and tended to disappear as they became scattered evenly through the endoplasm. Passive sinking of the posterior end was able to orientate the animal into a position of gravity equilibrium, with the anterior end up, only when it was moving in a narrow spiral or straight path. A magnet placed in the jar containing the iron-ingested paramoecium caused an upward streaming in the stronger part of the field. It was effective in producing circulation by diminishing the effect of gravity these animals. (PsycINFO Database Record (c) 2006 APA, all rights reserved)

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