16 RESPONSE IN THE LIVING AND NON-LIVING 
responses are modified by various conditions in exactly 
the same manner as those of animal tissues. In order 
to show how striking are these similarities, I shall for 
comparison place side by side the responses of animal 
tissues and those I have obtained with plants and 
inorganic substances. For the electric response in 
animal tissues, I shall take the latest and most complete 
examples from the records made by Dr. Waller. 
But before we can obtain satisfactory and conclusive 
results regarding plant response, many experimental 
difficulties will have to be surmounted. I shall now 
describe how this has been accomplished.’ 
1 My assistant Mr. J. Bull has rendered me very efficient help in these 
experiments. 
