On the Nervous System of Cassiopea Xamachana. 



155 



made in removing the sense-organs or the similar-shaped pieces of 

 tissue between the sense-organs of the active half -disk. 



The results of the measurements of size are completely in accord with 

 those obtained in studying the loss in weight of the same half-disks, 

 or the larger series of specimens prepared in the same manner, as shown 

 in table 6. Although in the greater number of regeneration experiments 

 no careful measurements were made of the decrease in the diameter 



Table 10. — Record for to 4 days. 



[Ten disks separated into active and activated halves, to show the comparative loss in weight, 

 decrease in diameter, and decrease in diameter of the cavity where a disk of tissue had been 

 removed in order to measure the amount of regeneration.] 



of the cavity in which the amount of regeneration was measured, the 

 differences in this regard between the different types of specimens was 

 easily distinguishable in all cases and was always parallel to the 

 relative rate of regeneration shown by either one of a given pair of half- 

 disks, by whichever of the three operations they had been prepared. 



INFLUENCE OF SENSE-ORGANS ON THE RATE OF GENERAL 

 METABOLISM AS MEASURED BY CO2 PRODUCTION. 



The results of the experiments recorded in the two preceding sections 

 show that the nerve-centers exert a decided influence on the rate of 

 metabolic activities when measured by two different standards. It 

 seems apparent also that, although the standards of measurement 

 adopted— regeneration and loss of weight during starvation — largely 



