auricle- and ventricle-systoles fall out again (still to be seen in the 
figure). Thereupon again and again but a little earlier one auricle- 
and one ventricle-systole fall out. Fig. 2 is reproduced 27 systoles 
after the former. In the upper row we see here p quadri- and trigeminus. 
Then for a short time larger groups occur again. So Fie. 3 is 
represented twenty systoles after the former. In this figure (upper row 
tt antr en am am Caen ee a oe Py on 
Fig. 3. 
Continuation of Fig. 2 but 20 systoles afterwards. 
of curves) a special peculiarity can be seen, which I observed on 
this curve-page only there, and then twice. After the first and also 
the second falling out of an auricle- and a ventricle-systole (fig. 3 
there comes a little later a new auricle- and ventricle-systole. The 
latter falls entirely beyond the normal heart-period, it is perhaps an 
extra-systole, originating in the auricle. which has then not caused 
an irritation of the sinus venosus by retrograde conduction (for the 
normal heartperiod is not disturbed, whilst the process continues), 
Another possibility is, that for this curve the conduction in the 
si—a-systems of connection is very slow, and consequently the fol- 
lowing auricle is so much retarded. 
In this figure again one systole falls out, but now such an ab- 
normally retarded systole does not occur. (3'¢ hiatus in the upper 
row). If now we measure here the duration from the beginning of 
the ventricle-systole before the pause to the beginning of the ventricle- 
systole after it, we find a duration that is much shorter than that 
of 2 heart-periods. 
This difference is caused by the abbreviation of the s/-a-interval 
and the a-v-interval after the longer pause. Moreover the last 
ventricle-systole before the pause begins very late, because the con- 
PT ewe 
{27 
