UPON THE VASCULAR SYSTEM. 



133 



Experiments showing the Effect of Division of the Vagi upon the Blood- 

 Pressure and Frequency of the Pulse in Animals during Digestion, 

 and during fasting. 



A. EXPERIMENTS ON DOGS. 



(a.) During Digestion. 



Cardio-inhibitory Nerves paralysed by Atropia. 



EXPERIMENT XXXII. — Reteiever Puppy about Three Months old, fed Three hours 



BEFORE THE EXPERIMENT. CANULA IN CAROTID ARTERY. TRACHEA OPEN. 



Time. 



Pulse in 15". 



Mean Pressure in inches 

 ofHg. 



General Notes. 



4-51' 



34 



4-5 



- 



59' 30" 







3 milligrammes atrop. sulph. in- 

 jected into vein. 



5-0' 15" 



46 



47 





5' 



46 



4-7 





12' 







Both vagi divided. 



16' 



52 



5-9 





21' 



50 



6-1 





27' 



50 



5-9 





33' 



54 



63 





34' 







Cardio-inhibitory nerves found to 

 be completely paralysed. 



Result. — Increase of pressure and acceleration of pulse after division of vagi. 



EXPERIMENT XXXIII.— A Terrier Dog, fed at 1.30 p.m. Canula in Carotid 



Artery. Trachea open. 



Time. 



Pulse in 15". 



Mean Pressure in inches 

 ofHg. 



General Notes. 



332' 20" 



30 



5.7 





50" 



30 



5-7 





37' 







1 milligramme atrop. sulph. injected 

 into vein. 



38' 15" 



56 



6-6 





40' 



62 



6-7 





45' 



56 



6-7 



Vagi not paralysed. 



55" 



56 



6-2 





50' 







1 milligramme atrop. sulphate given. 



20" 



56 



6-2 





53' 50" 







Both vagi divided. 



55' 



62 



74 





35" 



60 



7-6 





58' 55" 



54 



7 





59' 15" 







Cardio-inhibitory nerves found to 









be quite paralysed. 



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

 pulse after division of vagi. 



