OP THE GALVANIC CURRENT ON THE MOTOR NERVES OP MAN. 
969 
simultaneous make and break, and the stimulus depends on the former alone. With 
the kathode the polar region is kathodic, with the anode the peripolar region is 
kathodic; since the excitation proceeds in each case from the kathodic region, and 
since the current density is greater in the polar than in the peripolar region, the effect 
of the kathode is greater than that of the anode. 
2 . The effect of the kathode of the break induction current is increased when that 
kathode is also kathode of the galvanic current. 
With the kathode of the induction current the polar region is kathodic, and excita¬ 
tion proceeds therefrom. With the kathode of the galvanic current the polar region 
is kathodic, and excitation proceeds from a region in which the excitability is increased. 
The effect is therefore increased. 
3 . The effect of the anode of the break induction current is increased when that anode 
is also anode of the galvanic current. 
With the anode of the induction current excitation proceeds from the peripolar 
region. With the anode of the galvanic current that region is kathodic, and excitation 
proceeds from a region in which the excitability is increased. The effect is therefore 
increased. 
4 . The effect of the kathode of the break induction shock is diminished when that 
kathode is also anode of the galvanic current. 
With the kathode of the induction current the polar region is kathodic, and excita¬ 
tion proceeds therefrom. With the anode of the galvanic current the polar region is 
anodic, and excitation proceeds from a region in which the excitability is diminished. 
The effect is therefore diminished. 
5 . The effect of the anode of the break induction shock is diminished when that anode 
is also kathode of the galvanic current. 
With the anode of the induction current excitation proceeds from the peripolar 
region. With the kathode of the galvanic current that region is anodic, and excitation 
proceeds from a region in which the excitability is diminished. The effect is therefore 
diminished. 
6 . The increase in the effect of the kathode of the break induction current when that 
kathode is also kathode of the galvanic current , is greater than the increase in the effect 
of the anode of the break induction current when that anode is also anode of the 
galvanic current. 
With the double kathode it is the polar region whence excitation proceeds and 
wherein excitability is increased; with the double anode it is the peripolar region 
whence excitation proceeds and wherein excitability is increased. The augmentation 
in the effect of a given stimulus is greater in the former case than in the latter because 
the density is greater. 
7. The diminution in the effect of the kathode of the break induction shock when that 
kathode is also anode of the galvanic current, is greater than the diminution in the effect 
6 H 2 
