Law Governing Loss of Weight in Starving Cassiopea. 



59 



between the number of days the medusa has been starved and the per- 

 centage of nitrogen it contains. The medusae were desiccated at ioo C. 

 at Tortugas, Florida, and the dried substance was then sent to Boston for 



analysis. 



Table 2. 



100 



90 



80 



70 



60 



% .50 



40 



30 



20 



10 



1 Not weighed. 



1 2 3 4 5 6 7 8. 9 10 11 12 13 14 15 16 17 18 19 20 

 Days X 



Fig. I. 



It appears also that the dried weight is about 4.76 per cent^ of the living 

 weight, and that this ratio does not change as the animal starves. Thus the 

 living weight bears a practically constant ratio to the weight of the solid 

 substance of the animal, and the law governing the loss of rate may be 



'Of this 4.7 per cent, 3 5 per cent consists of the salts of sea-water; and thus the actual body-substance 

 of the medusa is only 1.2 per cent, the animal containing 98.8 per cent of water. 



