1037 
of the ventricle at the end of the diastole. Because the muscle of 
the ventricle is still refractory, no extra-systole of the ventricle takes 
place, but by current-loops the auricle is incited to extra-contraction. 
In this way the extra-pause occurs without extra-systole of the 
ventricle, and thereupon we see 9 systoles of equal height. Then 
the alternation sets in again, which is in the same manner transferred 
again into the normal rhythm of the ventricle by an extra-stimulation. 
I 
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6 “Sif 
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Proceedings Royal Acad. Amsterdam. Vol. XIX. 
