(16) 
place of this inflection-point depends greatly upon the depth of the 
narcosis, and the extent of the increase of the charge. The tonicity- 
quotient, which is very low at first, rises quickly, then slowly with 
increase of charge, reaches its maximum at the inflection-point and 
begins then to decrease. For this last part of the curve, where decreasing 
tonicity-quotients correspond with increase of charge, the law of 
FECHNER proved by approximation, to connect the increase of the 
charge with its effect, the corresponding value of the tonicity quotient. 
Starting from the well-known fact, that a high section of the 
medulla, after the shock is passed, gives rise to increase of muscle- 
tone and that therefore a physiological inhibition seems to dis- 
appear, the analysis of these curves was attempted in the following 
way. 
The stimulus, originating by extension in the terminations of the 
afferent nerves of the muscle, ascends along afferent paths and 
arrived in the spinal cord, it is directly transferred along a short 
path to the efferent part of the primary musele-reflex arc. About 
this we know that the law of FrcHNeR connects stimulus and its 
effect. But this same stimulus, ascending along the long path, 
which as secondary muscle-reflex arc is built upon the first, brings 
about a change which may be composed by addition with the change 
in the primary muscle-reflex arc. The supposition of the simple 
addition of the two influences on the muscle, has been stated very 
clearly, i.a. by SHERRINGTON. But if the law of Fecuyer holds 
true for that part of the curve which lies beyond the inflection-point, 
and this part is therefore not different from those tracings, recorded 
when the stimulus can only pass the primary reflex arc, then the 
physiological meaning of the inflection-point is this: the inflection- 
point in the curve appears at the moment, when the influence of the 
secondary muscle-reflex arc on the primary disappears. But knowing 
also that in these tonus-curves, the tone is at first very low, that 
it reaches its maximum at the inflection-point, at which moment 
the influence of the secondary on the primary muscle-reflex arc 
ceases, we have also to assume, that the stimulus passing through 
this secondary muscle-reflex arc, brings about a change in it, the 
effect of which is seen as the disappearance of a tone-inhibition. We 
assume now as second supposition that here too the law of FECHNER 
brings relation between the effect and its cause, the stimulus. 
The analysis is now possible in the following way. For a certain 
increase of charge the corresponding extent of the variation of tone 
is determined from the segment of the curve which lies beyond the 
inflection point. This is the basis for the further calculation as 
