CELLULAR METABOLISM 



113 



200 



100 



-300 -200 



Figure i. Relation between the catalytic power of dyes and its Eo to the oxidation- 

 reduction potential of starfish eggs. (Dyes which penetrate through the cell wall.) 

 Abscissa, Eo (in millivolts) of dyes at /'H 7.0. Ordinate, per cent increase of O2 con- 

 sumption after dye addition, i. phenol-indophenol ; 2. toluylene blue chloride; 3. methy- 

 lene blue; 4. cresyl blue; 7. cresyl violet; 8. safranine; 9. janus green; 10. neutral red. 

 From Barron and Hoffman, /. Gen. Physiol., 13, 483, 1930. 



TABLE VIII 



The Effect of Reversible Dyes on the Oxygen Consumption of Starfish Eggs 

 (Mature, Unfertilized). The Efifect of the Membrane Permeability. 



