Studies of Tissue Growth 



451 



A line of averages is calculated at the foot of the table. The 

 average size of the individuals with one arm removed was at the 

 time of operation 88.9 mm. in disk diameter. After 17 days they 

 had decreased 6.6 mm. in diameter and had regenerated new arm- 

 buds 3.4 mm. long. 



Tables IV, V, VI and VII contain similar data arranged from 

 the medusae regenerating two, four, six and eight oral-arms re- 

 spectively. 



TABLE IV 



Regeneration of the oral-arms in Cassiopea, when two arms are removed 



*Hole in disk due to parasites. 



A comparison of the regeneration in the several groups of medu- 

 sae is facilitated by table VIII, which is a tabulation of the aver- 

 ages contained in tables III to VII. The first column shows the 

 number of individuals composing each of the groups, the second 

 column indicates the number of mouth-arms amputated from each 



