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CHAPTER XI 
INORGANIC RESPONSE—MODIFIED APPARATUS TO EXHIBIT 
RESPONSE IN METALS 
Conditions of obtaining quantitative measurements—Modification of the 
block method—Vibration cell— Application of stimulus—Graduation of 
the intensity of stimulus—Considerations showing that electric response 
is due to molecular disturbance—Test experiment—Molecular voltaic 
cell. 
We have already seen that metals respond to sti- 
mulus by E.M. variation, just as do animal and 
vegetable tissues. We have yet to see whether the 
similarity extends to this point only, or goes still 
further, whether the response-curves of living and in 
organic are alike, and whether the inorganic response- 
curve is modified, as living response was found to be, 
by the influence of external agencies. If so, are the 
modifications similar? What are the effects of super- 
position of stimuli? Is there fatigue? If there be, in 
what way does it affect the curves? And lastly, is the 
response of metals exalted or depressed by the action 
of chemical reagents ? 
Conditions of obtaining quantitative measurements.— 
In order to carry out these investigations, it is necessary 
to remove all sources of uncertainty, and obtain quanti- 
tative measurements. Many difficulties at first presented 
themselves in the course of this attempt, but they were 
