36 



metabolic condilioii of (he venlricle-imiscle (\im depend upon the 

 eoiidilion of the Iraiiyniission-sysleins from (he point of beginning in 

 the auricle to that of tiie vend-icle. If namely (ir.s( (lie venrricle- 

 rh3(inn has been halved and afterwards the rhythm ot the auricle, then 

 I saw after the latter halving the a-?>-interval considerably reduced. 



Fig. -2. 



Halving of the ventrirle-rliyllim diu-ing llie first 3 systoles, whilst tlie 



rliytlim of the auricle is still normal. Thereupon the rhythm of the auricle 



halves likewise. The «-r-interv.il is then considerably shortened. 



As an example we cite as follows: In Fig. 2 we see a row of 

 curves of a sus|)ended frog's heart, represented 40 min. after tiie 

 injection of JO drops of acetas veratrini into the abdominal cavity. 

 During the first three systoles the rhythm of the ventricle is halved, 

 whilst the auricle-rhythm is still undisturbed. After this the following 

 auricle-systole falls out, so that on each then succeeding ventricle- 

 systole an auricle-systole appears. It is remarkable how considerably 

 the a-w-interval is now shortened. Apart from the influence of the 

 hiatus, that during some succeeding .systoles can improve the meta- 

 bolic condition of the heart-muscle, the condition of the ventricle- 



Fig. 3, 



The lower row of curves was represented 5 minutes after the row 



of curves of fig. '2 with greater rapidity of the drum. The a-v- 



interval is still considerably shortened. The upper row of curves 



was represented 10 min. before that of fig. 2. Time 1 sec. 



musculature remains unaltered, for the ventricle continues to pulsate 

 in the same rhythm. The condition however of the track of the 

 transmission of stimula from the point of beginning in the auricle 

 to that in (he ven(ricle has changed. 



