134 



DR RUTHERFORD ON THE INFLUENCE OF THE VAGUS 



EXPERIMENT XXXIV. — A Strong Retriever Dog, fed Two hours before the 



EXPERIMENT. CANULA IN CAROTID. TRACHEA OPEN. 



Time. 



Pulse in 15". 



Mean Pressure in inches 

 ofHg. 



General Notes. 



12-14' 



32 



6 





17' 



32 



6 





23' 







2 milligrammes atrop. sulph. in- 

 jected into vein. 



25' 



28 



4-8 





27' 



30 



5 





31' 30" 



30 



5-4 



Vagi not quite paralysed. 



32' 







1 milligramme atrop. sulph. given. 



30" 



42 



4-1 





35' 



36 



4-8 





36' 



32 



4-8 





38' 30" 



35 



5 





43' 







Both vagi divided. 



50' 



38 



6-4 





52' 



35 



6-8 





1- 3' 



34 



6-7 





4' 







Cardio-inhibitory nerves still para- 

 lysed. 



Result. — Permanent increase of pressure, and temporary acceleration of 

 pulse after division of vagi. 



EXPERIMENT XXXV— Small Dog Fed at One o'Clock. Canula in Carotid. 



Trachea open. 



Time. 



Pulse in 15" 



Mean Pressure in inches 

 ofHg. 



General Notes. 



5-49' 



30 



5 





50' 







2 milligrammes atropia sulphate 

 injected into vein. 



40" 



70 



5-8 





53" 



66 



5-4 





54' 10" 



66 



5 



Both vagi divided. 



40" 









56' 



64 



9-1 





59' 



60 



7-9 





6- 2' 



56 



6-4 





5' 



56 



6-5 





10' 



53 



6-6 





Result. — Increase of pressure after division of vagi. The frequency of the 

 pulse was diminished ; but it is doubtful whether or not a similar decrease 

 would not have taken place had the vagi remained intact. When the pulse un- 

 dergoes a great increase in frequency on the administration of atropia, as in the 

 present instance, a steady decrease almost always sets in shortly afterwards. 



