Law Governing Loss of Weight in Starving Cassiopea. 



71 



Table 11 shows the decline in weight of a single medusa of Cassiopea 

 xamachana starved 19 days in filtered sea-water, in the dark, at temperatures 

 ranging between 27.3 and 30.1 C, from June 30 to July 19, 191 1, at 

 Tortugas, Florida. During the first 10 days this medusa was placed in 



c 



40* 



30* 



20" 



10* 



A medusa of Cassiopea starved 

 19 days in the dark 



Diagram illustrating Table 11. 



400 c.c. of sea-water which was changed once each day. After this it was 

 placed in a glass vessel holding about 6 liters and the water was changed 

 constantly by mechanical means, thus giving an abundant supply of fresh 

 sea-water. Compare this with table 12 which shows the starving rate of a 

 medusa maintained in daylight. 



Table ii. 



* According to the formula y = 44.5(1 o.i)*. 



Remarks. On July 19 maceration began and the experiment was discontinued. 



Table 12 shows the decline in weight of a single medusa of Cassiopea 

 xamachana starved 20 days in the diffuse daylight of the laboratory, and 

 then for 15 more days in the dark, in filtered sea-water at temperatures 

 ranging between 27.3 and 30.1 C, from June 30 to August 4, 191 1, at 

 Tortugas, Florida. During the first 10 days this medusa was placed in 400 

 c.c. of sea-water which was changed once each day. After this it was 

 placed in a glass vessel holding about 6 liters and the water was changed 

 constantly by mechanical means, thus giving an abundant supply of sea- 

 water. The conditions of the experiment are comparable with those shown 

 on table 11, excepting that table 12 applies to a medusa starved in daylight, 

 while table 1 1 shows the decline in weight of one starved in darkness. 



