ILLUSTRATIONS 



no. 



PAOIS 



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 EfiFect of CaCU 0. 278 Af 50 



22. Curves Showing Net Electrical Resistance of Laminaria Agardhii 51 



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



11 



