712 



the R. When the velocity of the impulse-transmission of the ventricle is 

 so great, that apical negativity has already brought back the 

 initial oscillation of the string to the position of rest, before the 

 full basal negativity has developed itself, then the height of the R- 

 oscillation possibly increases at a retardation of the transmission. These 

 proportions are also reproduced in this way in the scheme Fig. 10. 



If on the contrary the maximal basis-negativity has already been 

 reached, before the apical negativity brings the string back to the 

 position of rest, then a retardation of the conductivity will no more 

 increase the height of R, but only widen its top. We tind these 

 proportions in the frog's heart after the hemorrhage. ') I hope to 

 come back to this subject more elaborately in a more extensive 

 communication. 



It stands to reason that the shape of the ventricle-electrogram is 

 not only determined by the velocity of impulse-transmission. 

 In a former communication of mine 1 indicated the partial asystole 

 of the ventricle as the cause of the modification of the shape. ") 

 Its shape can likewise change besides by the more or less mono- 

 phasical deduction (by killing the heart-tissue under one deducting 

 electrode). 



I shall restrict myself in this short communication to a few 

 remarks concerning the consequences of the views developed above. 



In the first place about the atypical ventricle-electrograms. In 

 these the proportions are as in Fig. 11 viz. a high, wide R, descent 

 of the line of connection between R and T and a negative T. 

 In such an electrogram the apical negativity has consequently been 

 removed backward *). This can be caused by retardation of \ elocity, 

 but in casu the longer distance that the impulse has to cover, 

 will most likely be the cause. In the light of these experiments 

 the shape of the atypical electrograms is conspicuous to us. 



components the same as in Fig. 10. It is obvious, that at modification of the 



velocity of impulse-transmission these tw^o components are likewise m.odifiedl 



As these modifications are for in an equal sense, the results are after all as 

 reproduced in Fig. 11 and 12. 



') Zeitschrift fur Biologie, Bd. 65, Seite 428. 



2) Archives Néerlandaises de Physiologie de I'homme et des animaux, Tome I, 

 p. 29, 1916 and Zentralblatt fur Biologie, Bd. 30, Seite 149, 1915. 



3) For the question under consideration it is of no importance, whether we 

 have to do here either with the basal and apical negativity or with the negativity 

 of the left- and the right- ventricle. When the two negativities coincide less, because 

 one of the two commences later, then the atypical shape of the ventricle-electrogram 

 sets in. 



