ILLUSTRATIONS 



PAGE 



1. Apparatus for Measuring the Electrical Conductivity of Muscle 



(Kodis) ....................................................... 22 



2. Apparatus for Measuring the Electrical Conductivity of Sea 



Urchin Eggs (Gray) .......................................... 23 



3. Apparatus for Determining the Electrical Conductivity of Living 



Tissue ........................................................ 24 



4. Electrode Carrier .......................................... 25 



5. Hard Rubber Disks, Alternating with Disks of Tissue ............ 29 



6. Diagram to Show Bridge and Connections ....................... 30 



7. Electrode Carrier ................................................ 31 



8. Disk of Tissue ................................................ 32 



9. Two Glass Cells each Provided with an Electrode with Strip of 



Tissue Between ............................................... 34 



10. A Disk of Hard Rubber, One of Tissue and One of Celluloid, 



Tied Together with Rubber Bands ............................ 34 



11. Disk of Rubber with a Mass of Tissue Wedged in the Central 



Opening ...................................................... 34 



12. Apparatus for Measuring the Conductivity of Nitella ............ 36 



13. Curves of Net Electrical Resistance of Laminaria Agardhii ....... 41 



14. Curves of Net Electrical Resistance of Laminaria Agardhii ...... 42 



15. Curve of Net Electrical Resistance of Laminaria Agardhii ........ 43 



16. Curve Showing Changes in the Hydrogen Ion Concentration of 



Sea Water .................................................... 44 



17. Curves of Net Electrical Resistance of Laminaria Agardhii ....... 45 



18. Curve Showing the Net Electrical Resistance of Laminaria Agardhii 46 



19. Curve Showing the Net Electrical Resistance of Laminaria Agardhii 47 



20. Curves Showing the Net Electrical Resistance of Laminaria Agardhii 48 



21. Curves Showing the Effect of CaCl 2 0. 278 M ................... 50 



22. Curves Showing Net Electrical Resistance of Laminaria Agardhii 51 



23. Curves of Net Electrical Resistance of Laminaria Agardhii ....... 52 



11 



