148 BIBLIOGRAPHY. 



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 the production of cell-walls and cells which, becoming polarized, 

 would elongate or become crescentic, and by an extension of their 

 lines of force would even form tubes, as in nerve-tissue. The rotation 

 of the frog-embryo within the egg was considered due to dextrorsal 

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 cited in support of this idea. The bi-concave form of the blood 

 corpuscles, their adherence by their flattened surfaces, the connection 

 of osmosis with electricity, and finally Dr. W. B. Richardson's experi- 

 ments as to the conducting power of blood, were held to establish the 



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