1155 
that only an existing current can be strengthened by it, in other 
words that the resistance to that current has decreased, or that the 
polarisation-current in the skin grows weaker, as appears from the 
latest investigations of GILDEMEESTER *). 
Now if the respiration, the plethysmogram and the galvanic reaction 
are simultaneously registered photographically, the effects of bodily 
stimuli and of psychical labour on these curves may be compared. 
In the first place it appears then that the modifications caused by 
them are chiefly dependent on emotions acting simultaneously. This 
appears from the weakened reactions of the plethysmogram and of 
the galvanometric deflection in consequence of the stimulus being 
repeated. 
aT osname neet 
This reaction on emotions supplies us with a very reliable means 
of distinguishing organic anaesthesiae of the senses from functional 
anaesthesiae and from simulation. Every sensory stimulus and every 
psychic labour effects considerable modifications in the plethysmogram 
and in the psychogalvanie curve. This investigation enabled me 
Respiration 
Psychogalv. 
curve 
1) Prrücers. Archiv. Bd. 162, p. 489. 
