Yolk-nucleus and polar rings
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Katharine Foot
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Article
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1896
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John Wiley and Sons
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English
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POLAR rings have been observed in CZepine by Grube, Leuckart, Robin, and Whitman,' in Rhymhelmis, by Vejdovsky? and in AlZolobophora foetidaa by the author. In the present paper I hope to prove that the polar rings and the so-called yolk-nucleus are one and the same substance, and that therefore th