709 



ventricle-systoles, and the wider in proportion as the ventricle- 

 systole was more iiiticipated. The T-oscillation of an anticipated 

 ventricle-systole changed in a negative sense, and the more so in 

 proportion as the ventricle-systole was more anticipated. The line 

 of connection between the R and the T had descended at an anti- 

 cipated ventricle-systole, this descent was the more considerable in 

 proportion as the ventricle-systole was more anticipated. At the 

 post-compensatory systole these proportions were exactly the reverse. 

 Then the velocity of impulse-transmission had improved, tiie 

 R-oscillation was narrower, the T-oscillation had changed in a positive 

 sense, and the line of connection between the R and the T had risen. 

 These short indications may be sufticient for the present. For 

 further particulars one must compare the ügures 6, 7, 8, 9 and JO 

 of my communication.^) 



IV. Theoretical explanation. 



It has appeared most clearly from the three series of experiments 

 described above, that there is a constanthj occurring connection between 

 the loidth {duration) of the E-oscillation {velocity of impulse-trans- 

 mission through the ventricle) on one side and the dimension and 

 direction of the T-oscillation and the level, on lohich the line o f con- 

 nection between the R and the T extends itself, on the other side. 

 When the duration of the R-oscillation increases, then the T-oscillation 

 changes in a negative sense, and the line of connection between the 

 /?, and the T descends.- If on the contrary the duration of the R- 

 oscillation decreases, then the T changes in a positive sense, and the 

 line of connection between the R and the T rises. The moditications 

 that the T-oscillation is subject to, had already distinctly displayed 

 themselves to me by the investigations I made in 191-ir. I think I 

 am now likewise able to explain more explicitly the modifications, 

 that the line of connection between the R and the T undergoes, and 

 to bring in this way tfie above mentioned experiments under one 

 point of view. 



The normal ventricle-electrogram consists chiefly of an R- and a 

 T-oscillation. Consequently we do not discuss here the Q- and S- 

 oscillation, because the occurrence of these -is of no importance what- 

 ever for oui- considerations. These R- and T-oscillations are caused 



1) I intend to explain iu a more ciicumstanlial communication more elaborately 

 the electrograms obtained after extra stimulation of the ventricle-basis and point. 

 We can for this purpose compare the electrograms of the more and less anticipated 

 systoles with each other, and not with those of the periodical ventricle-systoles 

 (Vide Fig. 6, 7 and 10 of the former communication.) 



51 



Proceedings Royal Acad. Amsterdam. XX. 



