There are three separate investigations that have been carried out on
the effect of wound on plants: The first is the shock effect of wound on
growth: this generally speaking retards or arrests growth. In the second
series of investigations the change of spontaneous pulsation of the
leaflet of the Telegraph plant was recorded. Death begins to spread from
the cut end of the leaflet, and reaches the throbbing tissue which
becomes permanently stilled on cessation of life. Experiments are in
progress of arrest their march of death, and the cut leaflet which died
in 24 hours has now been kept alive for more than a week.