150 



Papers from the Department of Marine Biology. 



of the mesogloea was, however, much more marked in that vacuoUzation 

 had become more easily noticeable. 



There is clearly a different tissue chiefly involved in the loss of 

 weight during starvation and in regeneration (see page 131), so that 



Table 6. — Record for to 4 days. 



[Twenty disks to show the differences in loss of weight during starvation between 

 active and inactive half disks.] 



these experunents present a standard of measurement of metabolic 

 activity sharply distinguished from that employed in the study of 

 regeneration. 



Mayer (op. cit.) has pointed out that the value of a (the coefficient 

 of negative metabohsm) has a different value for practically every set of 

 experimental conditions. Thus this value differs when employing entire 

 medusae, regenerating portions of oral amis or the bell-margin, disks 



