702 



now very strongly negative, and the line of connection between 

 the R-oscillation and the T-osciilation has descended more than in 

 the former photogram. 



Fig. 5 was taken 15 min. aftei' P'ig. 4. In the mean time the 

 rhythm of the ventricle has halved, but after every large 

 ventricle-systole still an abortive systole of the ventricle occurs. 

 This abortive ventricle-systole gives a little nearly triangular electi'O- 

 gram (d). During the halved ventricle-rhythm the velocity of 

 impulse-transmission through the ventricle has again considerably 

 increased. In accordance with this fact the li-oscillation has become 

 again much narrower. The T-oscillation is still negative, but has 

 become considerably smaller than in the former photogram. The 

 line of connection between the R-oscillation a,nd the T-oscillation 

 lies for a part somewhat above the position of rest of the string. 

 If we compare Fig. 5 and Fig. 3, then in Fig. 5 the R-oscillation is 

 narrower than in Fig. 3. In accordance with this fact the T of 

 Fig. o is likewise smaller than that of Fig. 3, and the line of 

 connection between the R-oscillation and the T-oscillation in Fig. 5 

 lies at a higher level than in Fig. 3. After the application of the 

 two poisons mentioned above these results were constantly obtained 

 by me. As long as the poisoning continues, and still before the 

 halving of the ventricle-rhythm has set in, the velocity of the 

 impulse-transmission through the ventricle decreases. The width 

 of the R-oscillation increases accordingly, the T-oscillation changes 

 in a negative sense and the line of connection between the R-oscil- 

 lation and the T-oscillation descends^). As soon as halving of the 

 ventricle-rhythm has set in the velocity of impulse-transmission 

 increases again ; the width of the R-oscillation decreases, the T- 

 oscillation changes in a positive sense, and the line of connection 

 between the R-oscillation and the T-oscillation rises ^). 



II. Artificial and spontdiieous inudijirations of rhijthiii. 



If we poison a frog's heart with veratrine, digitalis or antiarine 



If after the. poisoning ventricle alternation appears then the proportions 

 through the partial ventricle-systole during the little ventricle-systoles are of course 

 different (vide report of the Physiologendag, 20 Dec. 1917). More extensively about 

 this subject afterwards. 



2) From Fig. 1 to Fig. 5 included the width of the P-oscillation increases through 

 the poisoning, whilst the auricle-rhythm remains constant. The width of the R- 

 oscillation has consequently decreased in Fig. 5 in consequence of the halving of 

 the ventricle-rhythm, bul the width of the P-oscillation has increased, as the rhythm 

 of the auricle has remained unaltered. 



