348 MATHEWS. 



tected electrodes on chorda, Vago-sympathetic not cut. Can- 

 ula connected with air reservoir in the head end of the left 

 carotid artery. 



Before cutting, stimulation of the chorda, with secondary coil 

 at 200, causes a secretion of 0.15 cc. in 10 seconds. 



Head rapidly severed at 4.17 P. M. As soon as it was 

 severed I opened the cock, letting air into the carotid. I then 

 stimulated the chorda tympani at 4.18. Stimulation of the 

 chorda causes a secretion of .02 cc. Secretion then stops 

 and no more can be obtained by any strength of stimulus. 



Experiment LXVI. 



Conditions of the experiment as in Experiment LXIII. Be- 

 fore cutting off the head stimulation of the chorda for 10 seconds 

 with secondary coil at 180 causes a secretion of .17 cc. 



Head rapidly severed from body at 3.03. Chorda stim- 

 ulated at 3.03.45 for 20 seconds. Gland secretes .20 cc. 

 Air then forced into the carotid artery. 



3.04.30—3.05.30 stimulation of the chorda with secondary 

 coil at 130 causes .07 cc. Thereafter no secretion with a stim- 

 ulation of any strength. 



Experiment LXVII. 



Conditions of experiment the same as in Experiment LXHI. 

 Before decapitation stimulation of the chorda for 10 seconds 

 with secondary coil at 230 yields a secretion of 0.2 cc. 



Dog decapitated at 10.49. ^*^ forced into carotid as soon 



as cuttin 



igbe 



gan. 



Head sev 



^ered in 30 seconds. 





h. 



m. 



s. 









10 



49 



45 



Chorda 



10 seconds. Coil 230 



0.1 cc 



10 



50 



30 



t ( 



" " " 200 



0.05 



10 



52 





( ( 



20 " " 180 



0.05 



Thereafter no 



more 



secretion. 







Post-mortem examination shows the gland veins to be filled 

 with blood. The air does not seem to have penetrated the 

 gland. 



