970 MESSRS. A. WALLER AND A. DE WATTEYILLE ON THE INFLUENCE 
of the anode of the break induction current when that anode is also kathode of the 
galvanic current. 
With the combined induction kathode and galvanic anode the excitation and the 
diminished excitability are of the polar region with the combined induction anode and 
galvanic kathode, the excitation and the diminished excitability are of the peripolar 
region. 
The diminution of a given effect is greater in the former case than in the latter. 
That diminution is such that the effect of the combined faradic anode and galvanic 
kathode is greater than that of the combined faradic kathode and galvanic anode. 
This fact was observed by Bruckner, who saw in it a proof of electrotonus inasmuch 
as the previously more effective faradic kathode is rendered the less effective during 
the passage of an opposed galvanic current. 
To the statements 1, 2, 3, 4, 6, 7 we have found no exception in all our experiments ; 
statement 5, though expressing the usual event with currents of medium strength, 
requires qualification by this additional statement. 
8. With increasing strength of the galvanic current, the effect of the anode of the 
break induction current, when that anode is also kathode of the galvanic current 
diminishes to a minimum, and with further increase in the strength of the galvanic 
current increases up to and beyond the original normal. 
It is a constant phenomenon which is shown best with weak and moderate strengths 
of the induction current. We conjecture that it signifies extension of katelectrotonic 
influence in the previously anelectrotonic region (physiological) with increasing strength 
of the galvanic current. The increased excitability is in the polar region, the excita¬ 
tion is in the peripolar region in which excitability is diminished. But apart from its 
theoretical import, we lay stress on the fact as showing augmentation of excitability 
in the presence of opposed electromotive forces. We may observe further that with 
strong induction currents it does not appear, that with subminimal induction currents 
the increase is alone seen and only with greater strength of the galvanic current, and 
that exceptionally with induction currents of moderate strength the increase brought 
about by the galvanic current appears without previous decrease. 
In seeking confirmation of the hypothesis applied to the fact expressed in the 
preceding statement, we were led to look for an analogous effect with the combined 
induction kathode and galvanic anode, and found ourselves entitled to qualify 
statement 4 by the following statement:— 
9. With increasing strength of the galvanic current, the effect of the kathode of the 
break induction current, when that kathode is also anode of the galvanic current , 
diminishes to a minimum, and with further increase in the strength of the galvanic 
current increases, but not up to the original normal within endurable strength of the 
galvanic current. 
After several failures we verified this statement with moderate strength of the 
induction current. It is the converse of the preceding observation, and our inter- 
