711 



retardation of the transmission. The S{!heme of Fig. 11 may explain 

 this fact. Tlie basal and the apical iiegativil>- consist in this scheme 

 of the same curves as those of P^'ig. 10, but the apical negativity 

 has now removed more backward. 



Point (' is now much farther removed fiom <i than in Fig. 10. 

 What is now the consequence of this removal of the apical negativity? 

 In the first place that at the end of the electrogram the apical 

 negativity begins to domineer, and consequently the T becomes 

 negative. If the retardation of the transmission had been less 

 important, then this would only have reduced the positive T somewhat. 

 But the line of connection between the R and the T has likewise 

 descended. This is also to be understood. Whilst in Fig. 10 at a 

 given moment the basal negativity n interferes with an equally strong- 

 apical negativity n' the string remains thereby in the position of rest. 

 When now, on account of the retardation of the transmission, the 

 apical negativity is i-emoved to the end of the electrogram, then 

 the basal point // no longer interferes with n' but with m' , 

 which is removed farther from the position of rest. This holds now 

 for all points of the basal negativity after retardation of transmission. 

 These interfere consequently all with stronger apical negativities 

 than before the retardation. This is the reason why the line of 

 connection between the R and the T descends. This simple construction 

 teaches us, why at retardation of transmission not only the 

 R-oscillation widens, but also the T changes in a negative sense, 

 /, and the line of connection between the R 



r_ and the T descends. 



'. *-.^ A clear illustration of the experimental 



data. 

 I ^^ At an acceleration of impulse-transmis- 



^1 7/\ ^^on the R-oscillation will on the contrary 



\\ / \ become narrower and remove the apical 



•— ^' , \c negativity in a contrary direction i.e. to the 



/«' front. Then each point of the curve of the 



/ basal negativity will interfere with a less 



' important apical negativity than before the 



/' acceleration. The i-esult is then a rising of 



the line of connection between the R and 

 ^\y the T and an enlargement of the T as the 



' scheuie of Fig. 12 indicates. ^) 



y^^' 12. Still a few words about the height or 



1) I have used in the scheme of Fig. 11 and 12 for Ihe basal and the apical 



51* 



