cocoon thread to the recording lever of an Oscillating
Recorder to be fully described in the next Paper. The
pulsation continued even in this isolated condition for about
48 hours, after which the. spontaneous movement came. to
a stop. Further experiments showed that the arrest of
pulsation was not, in licative of mortality but of ‘latent life’
in a state of suspense, to be stirred up again by shock
stimulus into throbbing activity.
REVIVAL OF AUTONOMOUS PULSATION UNDER S'l‘lMl'lJiS.
I'Lrperinn-n/ {ML—In figure 84, is a seen record of the
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I’m. 31. —lteue\\:\l of autonomous activity in Ih'srtlmli'lm ,tl'lm’” ill *limtifilm by at‘tion of light. l'poenru- represents up-nion-nent. The horizontal lints below
represent d nations of t‘\[m~tlre to light.
action of light on the sub-tonic Hesmotlimn lea‘let at standstill. .\ narrow pencil of light from electric arc was first thrown on the lamina in which the presence of chlorophyll rendered photo-synthetic action possible. This had no etlect on the renewal of pulsation. But the autonomous activity was revived by the action of light_on the pulvinule. This preferential ell'ect on pulvinule showed that the reneval of activity vas due not to photo-syn- thesis bnt to the stimulating action of light. The pulsa- tion was also restored by chemical stimulants, such as dilute ether, and solution of ammonium carbonate.
