of stimulus. This is seen in the next two records which
were taken fter two hours. The ampiitude of response was
ot only ninished, but the recovery also was incomplete
Antayoist actions of Alkali and Acid Experiment exert antagonistic known Alkal acid and to are actionso th- spontaneous beat of the heart; dilute solu- ton of XaI arrests the beat of the heart in systolic contractio, wile ilute lactic acid arrests the beat in diastoe expansion. I have found identical antagonistic re- actosn the pulsating tissue of Desmodium gyrans, the
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Fi. 37. Autaguistic aetion of alkali and acid. Arrest of response in cotracti uder a (), restoration and inal arrest in expaion under ai a () telgraph plant agents also exer hir characteristic effects on the response of ims in a manner which is precisely the same. lt is very interesting to find that these This is seen illustrated in Fig. 37, where the application of Na0 arrested the response in a contracted state; after this, t antagonisic fect of dilute lactic acid is seen tirst, in it» wer of restoring the excitability; its conti-
