UPON THE VASCULAR SYSTEM. 



121 



In the above, notwithstanding the paralysis of the inhibitory nerves of the 

 heart, section of the vagi was followed by a most distinct increase in the fre- 

 quency of the heart's contractions, and a rise in the blood-pressure. 



EXPERIMENT XXI. — A Middle-sized Collie Dog. Canula in Carotid Artery. 



Trachea open. 



Time. 



Pulse in 15". 



Mean Pressure in inches 

 ofHg. 



General Notes. 



12- 3' 



29 



5-9 





9' 







0'67 milligramme atropia sulphate 

 injected into vein. 



10' 



35 



5'6 





30" 



35 



5-3 





11' 







0'4 milligramme atrophia sulphate 

 injected into vein. 



12' 



36 



5-2 





13' 



33 



5'6 





15' 



32 



5-3 





30" 







Left vagus divided. 



17' 



35 



5-8 





20' 30" 







Right vagus divided. 



22' 



39 



6-6 





23' 



39 



6-8 





28' 



40 



6-8 





29' 







Cardio-inhibitory nerves proved to 

 he paralysed. 



EXPERIMENT XXII. — A Spaniel Dog, five months old. Canula in Carotid Artery. 



Trachea open. 



Time. 



Pulse in 15*. 



Mean Pressure in inches 

 ofHg. 



General Notes. 



11-19' 



27 



36 





20' 30" 



26 



4-6 





23' 



26 



4-05 





30" 







0'67 milligramme atropia sulphate 

 injected into vein. 



24' 



30 



4-05 





27' 



38 



4-05 





30" 







0'4 milligramme atropia sulphate 

 injected into vein. 



28' 30" 



66 



4-3 





30' 



60 



41 





31' 30" 



60 



3-9 





35' 



50 



3-9 





40' 



53 



4-1 





41' 







Left vagus divided. 



42' 



60 



4-3 





30" 







Right vagus divided. 



45' 



68 



5-1 





47' 







The cardio-inhibitory nerves were 

 found to be completely paralysed. 



