430. Max Mapes Ellis 
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The differences between these amounts are slight, but subsequent 
observation shows them to be significant. ‘The relation between 
the amount regenerated at this time and the amount removed 1s not 
a proportional one. ‘The series of particular interest at this time 
is Series S (15 mm.) which had no measurable regeneration at the 
end of the third day. The regeneration of this series was recorded 
as zero because the amount regenerated was too small to be accu- 
rately measured; there was, however, regeneration present at the 
end of the third day, as in most cases a distinct film of new tissue 
was visible. All of the wounds were healed at this time. By con- 
sulting Table 13, the amount of regeneration can readily be 
followed. 
All of the series, including Series I, had definite regeneration at 
the end of the sixth day. ‘These amounts were arranged according 
to the amount removed, although not proportional to it. The 
ninth day measurements bear the same relation to each other, 
that is, the amount regenerated varied in the same direction as the 
amount removed, but was not proportional to it. ‘The ninth day 
percentages, however, were distinctly nearer the same than those 
of the third or sixth day. ‘This places the relation of the amount 
regenerated to that removed, much nearer the proportional. The 
amount regenerated by Series O at this time was I.4 mm., 44 per 
cent of the amount removed. Subsequent measurements show 
that this series never regenerated beyond this per cent, which 
remained constant throughout the remainder of the experiment. 
On the twelfth day Series P also ceased regenerating, its final 
amount of regeneration being 2.3 mm., 44 per cent of the amount 
removed. ‘Thus, on the twelfth day after the operation, two of the 
series, O and P, had reached a limit of regeneration, which was 
proportional to the amount removed. ‘The other two series, R 
and S, although not having regenerated the same percentage as 
that regenerated by Series O and P, were not far below it. The 
