THE ACTION OF ETHER ON PROTOPLASM. 475 



2. Ether does not lower the permeability of sea-urchin eggs 

 to water. 



3. Dilute ether solutions cause a very sharp decrease in the 

 viscosity of sea-urchin egg protoplasm, both in fertilized and 

 unfertilized eggs. Rough quantitative measurements of this 

 decrease are given. 



4. Slightly more concentrated solutions of ether produce a 

 coagulation which is irreversible. 



5. The divergent results of Chambers find a simple explanation. 



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