386 PRINCIPLES OF GENERAL PHYSIOLOGY 



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FKJ. 106. ELECTRICAL, CHANGES IN THE TRUNKS OK THK v.un-s AM> i.i;n:i>s..i; \u;vi-> IN 



NATURAL CONDITIONS. RECORDED BY THE STKINc i;.\l.\ \NnMKTER. 



A, Vagus. Rabbit. 



First curve from above Electrical changes in the part of the cut vagus in connection with the lung 1 . 

 Second curve Respiratory movements. Inspiration upwards. 

 Third curve Heart beats. 



1 mm absciss8B = 0'2 second. 1 mm. ordinates = 3'5 microvolts. 



Note that the electrical change is congruent with the degree of distension of the lungs, and that there is no 

 change corresponding to the heart beats. 



