This caused a depression of growth rate to 0'04 ,u per
second. A transverse cut, I find, gives rise to a more. intense stimulation, than a longitudinal slit.
TABLE Xth.——-t'}t“b‘l*ll‘l‘ 0|? MECII.\‘II(3;\L llttilttAt‘lth .\.\ll\ Ht“ WOUND 0N thOW't‘lt.
(Zap/lynch lites.)
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tNaturo of stimulus. (‘onditiou. Rate of growth. ' l i t j Mechanical t'ric- Normal rato 0'18 ’1. per sec. ‘ i tion.
Immediately after sti—
mulation ()‘11 ,1, ,,
i 15 minutes after sti- t mutation (l'l-l p. ,,
- tit) minutos after sti—
l mutation 0'18 in ,, I l m . — “I
- Prick with needle Normal rate 0'18 ,1. per soc.
- lmnu-diatety after st i-
! mutation 0'05 ,1, ,, 3 15 minutes after sti- t mutation 0'07 ,1. ,, i l tit) minutes after sti- i I mutation 0'12 ,u ,,
The effect of mechanical stimulus on growth is thus similar to that induced by electrical stimulus. Mode-ate stimulus of rough contact induces an incipient contraction, seen in retardation of growth, the recovery being complete in the course of an hour; but intense stimulation, induCed
