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Fig. 5. — Aggregation of a precipitate of osmic dioxide in dilute glycerin. 



As the precipitate sinks in the solution the particles become aggregated into a network almost exactly 

 similar to that formed by living Euglenae as shown in fig. 2. (From Phil. Trans, vol. 201.) 





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Fig. 6. — From photographs, natural size, showing a, the aggregation of living Euglenre into 

 groups b, the aggregation, i.ito similar groups, of a precipitate of csmic dioxide as 

 it sinks in a solution of glycerin and water. (From Phil. Trans. B, vol. 201.) 



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