Page:Researches on Irritability of Plants.djvu/154

record. It will thus be seen that the latent period decreases with rising temperature.

The following table gives the results of several experiments on the effect of temperature on the latent period:—

Table III.—Effect of Temperature on the Latent Period.

Number.	Temperature.	Latent period.
⁠1 .. $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	23° 28° 33°	.165″ .125″ .065″
⁠2 .. $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	24° 29° 33°	.140″ .102″ .070″
⁠3 .. $\scriptstyle {\left\{{\begin{matrix}\ \\\\\ \ \end{matrix}}\right.}$	20° 25° 31°	.190″ .10″  .08″

Summary

Alternating electric shocks of moderate intensity induce simultaneous excitation throughout the interposed tract.

Latent period is in general shorter under stronger intensity of stimulus. There is no further variation above a maximal.

In the optimum condition of the plant the latent period is the same for feeble and strong stimulus.

Fatigue prolongs the latent period.

The latent period is shortened by a rise of temperature.