442 Max Mapes Ellis 
TABLE 7 
f F | | | 
FINAL | | AVERAGE 
| DAYS OF 
AMOUNT | AMOUNT DAILY RATE 
| REGENERA- | 
REMOVED | REGENER- OF REGEN- 
| TION 
| ATED ERATION 
| 
mm. mm. mm. 
Series Oe raya ara ieaicts sis seldhee wien Bez | 1.4 9 0.16 
. | | 
Sees Po ooco ake ta senoe ce pode arbete dain iynz | 2) 12 | 0.19 
SEriespe Toe Se iie ote octen bee ETS a daae 10.4 | 5.0 15, 0.33 
SETLES Spars Fay ete eae fot FS aera sit's, 2) 08 a SAO eras | 14.8 | 7.2 18 0.40 
Serestly (iG) severe aceite estonia etiter | 20.2 ° Died in 4 to 6 days 
Sermeswll(a) sp cacpidcaie ese atecuie sine eee 20.2 | 4.1 15 0.27 
| - 
| 
From this table it is to be seen that although the per cent 
regenerated was the same, regardless of the amount removed, 
the rate of regeneration varied with the level of injury, as the 
level moved away from the tip of the tail. Precisely the same rela- 
tion between the level of injury and the rate of regeneration has 
been found to obtain for the arms of the star-fish, Asterias, by King, 
1898. She states: “The rate of regeneration is greatest from the 
disc and decreases directly towards the tip of the arm.”” Morgan, 
in 1902, stated that the regeneration from straight cuts across the 
tail of the fish, Fundulus, proceeded more rapidly from the higher 
levels. In the recent paper of Stockard on the regeneration of 
Cassiopea xamachana, one finds the following observation: “The 
regeneration rate is fastest at the deepest level, and slower as the 
level nears the margin. . . . . The Medusa regenerates 
tissue faster the farther away from the periphery the cut is made, 
as though the more tissue removed the less uninjured body- “surface 
remained to exert a retarding influence.” 
Thus the data collected concerning this relation of the amount 
and rate of regeneration from various levels of the same organ, 
agree in supporting the hypothesis that regeneration always pro- 
ceeds more rapidly from the higher or deeper levels of the same part 
or organ. 
The amount regenerated by the four individuals surviving the 
removal of 20 mm. of tail in Series T was added to Table 7, as 
