So RESPONSE IN THE LIVING AND NON-LIVING 



effect of very dilute KOH, and fig. 49 exhibits nearly 

 complete abolition of response by the action of the same 

 reagent when given in stronger doses. 



So we see that, judged by the final criterion of the 

 effect produced by anaesthetics and poisons, the plant 

 response fulfils the test of vital phenomenon. In 

 previous chapters we have found that in the matter 

 of response by negative variation, of the presence or 

 absence of fatigue, of the relation between stimulus and 

 response, of modification of response by high and low 

 temperatures, and even in the matter of occasional 

 abnormal variations such as positive response in a 

 modified tissue, they were strictly correspondent to 

 similar phenomena in animal tissues. The remaining 

 test, of the influence of chemical reagents, having now 

 been applied, a complete parallelism may be held to 

 have been established between plant response on the 

 one hand, and that of animal tissue on the other. 



