Papers from the Marine Biological Laboratory at Tortugas. 



39 



-V~', 



Sea. water 2.*?' 



7b' Se.a.wa.te- -v- 25 clcytro-^e 



2.r<& C 



i> II 



so sea w^-ter +- 50 cle;ctfo 



.e 



2%C 



ijo sea. -water -\- socVextvose 



Fig. 4. 



29*C. 



\'N/'- W') 



50 distiUeci wc-Ltev +- bo seav. vvaier 



Z^i 3 C 



jUVJV_A_JV_AJVJUV_AJVJVA-iV_A_AJV^^ 



sea water ZS" 1 C 



-W\^^v-VK-^ 



33. 3i clcTttroSe -V fct.tt sea- watev 



31.^5 C 



i+-z clev^tvose -H 5% sea water 



2^1 C. 



i^^^^b^ 



jv. 



2.5 cl IS "I iLlccl + 75 sea vv/atev 



____JV /"v^v r\ 



J li Kj i , % '^ 5 6 n-^ 'P^A 2 g! 7 5 C 





sea. Nwa-lev 



2 7' C. 



Table 5 shows the relative rates of pulsation of 2 medusae and of nerve- 

 conduction in 20 rings of subumbrella tissue of Cassiopea in sea-water, and 

 in sea-water mixed with 0.9 molecular dextrose. 



Table 6^ shows the relative rates of nerve-conduction in subumbrella 

 tissue of Cassiopea xamachana in sea-water diluted with distilled water, and 

 also in sea-water diluted with 0.9 molecular dextrose. (See tables 4 and 5.) 

 The practical coincidence of these two curves indicates that the changes 

 in rate of nerve-conduction are due to corresponding changes in the con- 

 centration of the electrolytes and not to changes in osmotic pressure. 



1 See fig. 6, which shows that these two curves are apparently identical, the differences between them 

 being probably due to errors of experimental nature and individual variation. 



