22 INDUCTION SHOCKS 
same inductorium or with inductoria of precisely similar 
construction, and the position of the secondary coil 
with respect to the primary must not be altered. In 
view of the fact that moving the secondary coil is the 
usual method among physiologists for varying the 
strength of stimulus, this instrument clearly does not 
altogether meet the requirements of physiological work. 
It has, moreover, the somewhat serious shortcoming 
of taking no account of the method of applying the 
stimulating electrodes, so that, even were all the other 
conditions met, the electrodynamometer would still fail 
to give wholly complete measurements. 
Our examination of the various systems hitherto pro- 
posed for measuring induction shocks bears out the 
statement made at the outset that none of them meets 
fully the requirements of quantitative work. We are 
justified therefore in submitting a system which, although 
not new, being an extension of the Fick-Kronecker 
method, attempts to deal with all the factors concerned 
in the production of faradic stimuli, so that henceforth 
the values of stimuli may be expressed in such terms 
that they can be duplicated or modified quantitatively 
at will. 
