xxiv RESEARCHES ON IRRITABILITY OF PLANTS 



FIG. PAGE 



186. Effect of potassium cyanide ...... 339 



187. Arrest of pulsation of the heart of frog at diastole by the 



action of dilute lactic acid ...... 339 



188. Arrest of pulsation of Desmodium at diastole by application 



of dilute lactic acid ....... 340 



189. Arrest of pulsation of heart at systole, by the action of dilute 



sodium hydrate . . . . . . . .340 



190. Arrest of pulsation of Desmodium at systole by the application 



of dilute solution of sodium hydrate .... 340 



