1141 
falling out of a heart-period appeared distinetly. I will just fix the 
attention to one deviation that 1 detected. When I fixed in the 
bigeminusgroups the a-v-interval, calculated from the beginning of 
the auricle-systole to the beginning of the ventricle-systole, 1 con- 
stantly obtained for the large ventricle-systole, occurring after the 
hiatus, a greater value than for the next little second systole. 
This would consequently be entirely in contradiction with the 
irrefutable fact, that after longer pauses this interval decreases. | 
think, | am able to indicate the cause of this phenomenon, it is of 
a pure technical nature, and depends upon the manner of registering. 
The first ventricle-systole of each bigeminus-group begins in the 
beginning of the diastole of the preceding auricle-systole. Conse- 
quently the entire heart is lengthened at the beginning of this ventricle- 
systole by the then allongating auricle, and shortened by the ventricle 
which at the same time passes into systole. The beginning of the 
systole is consequentiy only expressed in the curve, as soon as the 
shortening of the ventricle prevails; this causes the retardation. This 
is not the case with the second ventricle-systole of every bigeminus- 
group, because the ventricle-systole begins later, and moreover the 
preceding auricle-systole during this process is very little. I did not 
“a 
In the curve-row 3 the reproduction of the curves of the auricle-systoles 
changes, as soon as these occur in the beginning of the ventricle-systole. 
