( 274) 



The cross indicate-; (lie place where 3 git. of a 3 /„ KCI-Solution 

 are dripped upon the heart, which after some time causes a stopping 

 of the form-cardiogram, while the electric phenomenon is altered. 

 Shortly after the KCl-application some feeble movements of the heart 

 are still perceptible in the lexer, but they soon stop, whilst the 

 electric fluctuations, which in the beginning of the chemical stimulation- 

 process had become slight, have now nearly reached their original 

 size again. 



In fig. 2 the stopping of* the heart is seen, while the electrocar- 

 diogram remains. 



With another trial-object 'Anodonta fluviatilis), besides those 

 described, also other peculiarities were observed. When by the action 

 of the chemical materials (he heart had stopped, the electric pheno- 

 menon with the usual frequency of the heart-contractions every time 

 continued manifesting itself periodically. But besides this periodicity 

 it was also clearly observed thai in these rhythmic electric phenomena 

 mutually other group-formations appeared, which possessed about the 

 same duration as the periodic length-fluctuations of the autotonus, which, 

 before (he stopping of the form-cardiogram, had already been clearly 

 perceptible also in the form-cardiogram. 



Also with other animals I had an opportunity to collect data for 

 the independence of the electrocardiogram of the form-cardiogram. 

 The following experiment proves this beyond the possibility of 

 doiilit in the heart of Tripodonotus natrix under digitonine-poisoning. 

 The heart of a ringed snake was prepared in the afternoon of May 

 29 th . After laying it bare and tying off the veins, the heart was cut 

 out and fixed upon a cork-plate, while the heart-basis and ventricle- 

 point were conducted to the si ring-galvanometer as described above. 

 The movements of the atrium and ventricle were registered according 

 to suspension-method. Fig. 3 gives the photografic registration of the 

 form-cardiogram and electrocardiogram in the unpoisoned heart. 



That same afternoon 5 git. <>M° digitonine dissolved in 0.9° NaCl 

 having been added to the heart, we see after some time the typical 

 phenomena of the digilonine-inloxication appear. The next day the 

 heart shows no more alterations in form, unless by means of some 

 expedients (washing with 0.9" „ NaCl and dripping on of 5 git. of 

 CaCl 1" , and 3 git. of KC1 3 u / ). At 11.30 p m. the heart stands 

 quite still. Notwithstanding this the electric phenomenon quietly 

 continues rhythmically. This state lasts till May 3i st . Constantly the 

 electrocardiogram shows the usual spontaneous rhythm. Now l u / 

 digitonine is anew and abundantly dripped upon the heart, which 

 causes a marked effect upon the electric phenomenon. This effect 



