_Abnormal acceleration of growth under electric stimulus: Experiment 88._--For my present purpose I took a sub-tonic specimen of seedling of wheat, its rate of growth being as low as 0.05 µ per second. After electric stimulation the rate was found enhanced to 0.12 µ per second, or about two and-a-half times. I give (Fig. 82) two records obtained with two different specimens. In the first, the record was taken on a stationary plate (Fig. 82). The closeness of successive dots in N show the feeble rate of growth of the sub-tonic specimen, the wider spacing after stimulation, S, exhibit the induced enhancement of growth. [Illustration: FIG. 82.--Enhancement of rate of growth in sub-tonic specimens of wheat seedling. First series of record on stationary, second series (_b_) on moving plate N, record before stimulation. S, after stimulation.] In the second experiment the records (Fig. 82_b_) were taken on a moving plate. The specimen was so extremely sub-tonic, that its normal record N appears almost horizontal. The greater erection of the curve, S, after stimulation demonstrates the induced acceleration of growth. TABLE XX.--ACCELERATION OF GROWTH BY STIMULUS IN SUB-TONIC SPECIMENS. +---------------+---------------------------+---------------+ | Specimen. | Stimulus. |Rate of growth.| +---------------+---------------------------+---------------+ |Wheat seedling |Normal |0.05 µ per sec.| | |After electric stimulation |0.12 µ " " | +---------------+---------------------------+---------------+ |_Kysoor_ |Normal |0.30 µ per sec.| | |After 5' exposure to light |0.40 µ " " | | | " 30' " " |0.27 µ " " | +---------------+---------------------------+---------------+ In my previous Paper on the ‘Modifying Influence of Tonic Condition’ I showed that while the response of the primary pulvinus of _Mimosa_ in normal condition is _negative_, i.e., by contraction, diminution of turgor, and fall of the leaf, the response of a sub-tonic specimen is _positive_, that is to say, by expansion, enhancement of turgor, and erection of the leaf. I have shown further that in a sub-tonic specimen the action of stimulus itself raises the tissue from below par to normal or even above par, with the conversion of abnormal positive to normal negative response.