Papers from the Marine Biological Laboratory at Tortugas. 



37 



in tables 4 to 6. In all these tables the rate is reduced to 100 per minute 

 in natural sea-water in order to facilitate comparisons. Thus, if on the 

 average the medusae actually pulsated at the rate of 80 per minute in natural 

 sea-water, and at 40 per minute in some other solution, these numbers would 

 become 100 and 50, respectively, in the tables. 



Sea water 



50 sea. v^ya-ter 4. 50 elisttUed v/a-ter 2.%?7. - if.r 



75 sea. wA-ter -t- 2.5 dlstiLlecL water i*.°S 



/\yv\/\..x/v vv/N^'o 



7S sei watev -»- 2.5 distilled vva-ter 

 Fig. 3. 

 Table 4 shows the relative rates of nerve-conduction in 20 rings, and of 

 pulsation in 4 normal medusae of Cassiopea xamacliana in sea-water and sea- 

 water diluted with distilled water at 29° to 31° C. 



Table 4 



2<).'» C 



^See record, fig. 3 



