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Dawison, J. A., 1920. An experimental study of an araicronucleate Oxytricha. 



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 Diirken, B., 1920. Versuche über die Erblichkeit des in farbigem Lichte er- 

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Induktive Abstaiuinungs- und Vitrerbungslehre. XXVIl. 2a 



