PROTOPLASM 



FIG. 



11. Diagram of a drop of oil containing particles of lamp-black in sus- 



pension, showing the position assumed by the lamp-black under 



the action of extension-currents . . . . .69 



12. Diagram showing the extension-currents produced in a drop of oil 



when approached by a bent platinum wire, heated by means of an 

 electric current ....... 72 



13. Diagram showing the extension-currents produced in a drop of oil 



in contact with a capillary tube containing soap solution . . 73 



14. Diagram showing a method of obtaining circulatory extension- 



currents in a drop of paraffin oil . . . . .74 



15. The same as Kg. 5 . . . . - . .76 



16. Diagram of a section through a drop of oil imder the cover-slip when 



free from pressure (A) and when compressed (B) . . . 78 



17. Sketch of two streaming drops of oil-foam in closed cells . 80 



18. Diagram representing the true reticulum (a) with an exact focus, 



and the false optical reticulum (J) with a higher focus . .215 



19. Diagram of the currents set up in a drop of water on a slide, when 



approached by ether on one side. To show the currents ivory 

 black has been mixed with the water .... 301 



20. Diagram of a median longitudinal section through the drop shown 



in Fig. 19 . . . . . . . . 302 



21. Diagram to show the currents in the growing pseudopodium of an 



Amoeba ........ 311 



22. Diagram of muscle contraction ..... 325 



23. Diagram of rotational streaming in plant cells . . . 328 



