Nerve-Conduction in Cassiopea Xamachana. 



17 



the solubility of particles of barium sulphate is about inversely propor- 

 tional to the size of the particles; and as colloidal particles are more or 

 less soluble, one would expect their solubility to increase as the average 

 diameter of the particles decreased. 



VIMAMAAAAAAAAAAAMAAAAAA/^^ 



Sea. wa.ter ^S.C. . . 



' i '*'' 



M/\MAM^^ 



zo 



70- 



30 3l 



AM/WWMWW\AM 



60 



50 



50 - 



^MMM/w^^^^j\/\/\A^^Jww\A^^ 



"Returned to sea. water 30% 



FIG. 12. A ring of Cassiopea in diluted sea-water, showing decline in rate of nerve-conduction 

 as dilution proceeds; also recovery of rate when the ring is replaced in natural sea- 

 water. 



. > . . . . . . ....->. 



JVVVVVVVWXNW 



< -wv. .+ 2. CA C t 2.<i> .a.c. 



io o^ .97>io" fe H^O 



FIG. 13. Showing change in rate of nerve-conduction in eubumbrella ring of Cassiopea in 

 NaCl+CaCl 2 . In the lowest line the movement of the ring has become very irregular, 

 indicating that it is about to stop. 



