(12) 
The number of tracings I have measured amounts to 22 derived 
from three cats. It appears from these measurements, that within the 
given interval of the increase of the charge, the deviations between 
the measured values and those calculated by means of the given 
formula are not more considerable than was to be expected in 
connection with the accuracy of the method. But already in the 
tables given in my previous communication and also in the tables 
of these measurements it is clear, that the deviations of the begin- 
ning of the curve are most considerable and that they decrease 
rapidly with increasing charge. All these deviations fall in the 
same direction. It is therefore probable, that they are due to a 
definite cause, and in my opinion, it is to be found in the law of 
FECHNER, which according to its deduction is to be considered only 
as a “loi limite’. JI hope to return to this point in a following 
series of experiments. 
Then I directed my attention to the two constants A and B, 
which occur in the formula representing the distention curve. 
It was proved by the experiments, that when a distention-curve 
was recorded during the period of shock or with intact medulla 
in deep narcosis, a straight line was found within a certain interval 
of time and increase of charge. In a case where the shock was 
very severe, the rectilinear part of the curve was found to cover an 
interval of the increase of charge not exceeding 130 grs. This 
increment of charge took place in 50 sec., the initial charge 
amounting to 38 grs. Other muscles gave other values which however 
deviated but little. If the experiment was extended over a greater 
interval of time and increase of charge, the elastic after-phenomena 
modified the shape of the curve in a considerable way. 
As we know, that under shock and deep narcosis the efferent 
(motor) part of the muscle-reflex arc (e.g. from the pyramidal tract) 
remains irritable, while it appeared at the same time that when 
the shock was disappearing, the linear curve passed into the curve 
which we know as characteristic for the tonic muscle, we had 
an indication of the way in which to proceed with the analysis; 
for the given formula of the distention curve leads to a linear curve 
for B=0. It is therefore obvious to consider the term Bp lgn. p 
as the representation of the influence of the afferent (sensible) part 
of the muscle reflex arc on the distention curve. It is difficult to 
decide, whether the linear distention-curve / = Ap is to be considered 
as typical for a muscle when only under influence of its efferent 
nerves, or whether this formula is only to be taken as a first approx- 
imation, implicitly implied in the law of FecHNeR which served us as 
