710 



by interference of' the basal with the apical negativity. The upward- 

 oscillation by which the ventricle-electrogram begins, originates, 

 because the negativity of the basis begins or domineers in the be- 

 ginning. A short time afterward the apical negativity begins (or the 

 apical negativity increases) and brings the string back to the position 

 of rest. Then there is for some time equilibrium between the basal 

 and the apical negativity, and the string remains in the position 

 of rest. 



Thereupon the T-oscillation comes into existence; if this T-oscilla- 

 tion is positive, consequently in the same direction as the R-oscilla- 

 tion, this is caused by the fact, that the basal negativity lasts 

 longer than the apical negativity, or because in the end the basal 

 negativity domineers over the apical negativity. If the T-oscilla- 

 tion is negative, consequently in a direction opposite to that of the 

 R-oscillation, then the apical negativity lasts longer than the basal 

 negativity or then, in the end, the apical negativity domineers over 

 the basal one. In Fig. 10 I have represented the origin of the R 

 and the positive T by interference of the basal negativity a — b — c 

 with the apical negativity e — ƒ — g. When now the velocity of 

 impulse-transmission decreases, then the apical negativity will 

 begin (or increase) later after the beginning of the basal negativity, 

 and bring the string back to the position of rest. On account of 

 the retardation of the transmission the position of rest is now reached 

 at a later period. 



The width of the R-oscillation increases thereby. But the other part 

 of the ventricle-electrogram is likewise greatly influenced by the 



: \ 



-^^^ 



f 



--'/ 



>z' 



»^' 



Fig. 10. 



f'-'' 



Fig. 11. 



