UPON THE VASCULAR SYSTEM. 



141 



EXPEEIMENT XLV. — Strong Eabbit Fed at 11 a.m. Canula in Carotid Artery. 



Trachea open. 



Time. 



Pulse in 10". 



Mean Pressure in inches 

 ofHg. 



General Notes. 



1-28' 







8 milligrammes atropia sulphate 

 injected into vein. 



35' 



46 



3 





37' 



44 



2-75 





44' 







2 milligrammes curara injected into 

 vein. 



47' 



44 



2-8 





48' 30" 



41 



2-7 





49' 







Both depressors divided. 



51' 



42 



2-8 





52' 10" 







Eight vagus divided. 



53' 



43 



3 





30" 







Left vagus divided. 



54' 20" 



42 



4-2 





55' 40" 



41 



4-1 





57' 



40 



4-2 





59' 10" 



43 



4-3 





2- 2' 



40 



4-1 



Cardio-inhibitory nerves still para- 

 lysed. 



Result. — Division of vagi followed by rise in bloocl-pressure, but by no change 

 in frequency of pulse. The animal having been paralysed by curara as well as 

 by atropine, this rise in pressure cannot be ascribed to anything but a change 

 within the vascular system independent of extraneous muscular movements. 



EXPEEIMENT XLVL— A Full-Sized Cat Fed at 2.20 p.m. Canula in Cakotid. 



Trachea open. 



Time. 



Pulse in 10". 



Mean Pressure in inches 

 ofHg. 



General Notes. 



4-40' 



30 



4-5 





45' 







5 milligrammes atrop. sulph. injected 

 into vein. 



30" 



38 



4 





47' 







Both depressors and cervical sym- 

 pathetica divided.* 



48' 



36 



5-1 





49' 30" 



36 



5-1 





52' 







Both vagi divided. 



53' 



39 



6-4 





58' 



39 



6-3 





5- no" 



38 



6-2 





4' 



39 



6-4 





5' 30" 







Cardio-inhibitory nerves still para- 

 lysed. 



* In the cat the depressor nerve usually joins the trunk of the sympathetic soon after leaving 

 the vagus in the upper part of the neck. It is, therefore, most convenient to divide both sympathetic 

 and depressor. 



