224 
(2) Experiments on dogs with vagi intact. 
Experiment 9—Dog, weight 94 kilos., ‘1 gramme morphia — 
hypodermically ; ether during operation. 
J. MARTIN. 
Exe 
‘4 1 tthe stil - 
Time. pressure et at : Remarks 
in rt beat! 
hrs, mins. secs. mm. | ; 
Normal 95 21:0 | -00001 gramme per kilo. injected into 
de sawed vein; injection lasted 2) 
0 2 30 64 1:0 
| aN Gee I 52 8 
e170 8 65 10 | right and left vagi cut; no effect 
0 10 30 65 1:0 
The restraining effect of the vagus on the heart beat was vely 
marked in this dog. It disappeared in one minute after the 
injection of the poison, and when the vagi were severed this was 
followed by no alteration in heart beat or blood pressure. 
Experiment 10—Dog, weight 4 kilos. -065 gramme morphia 
hypodermically; ether during operation. 
Oe gp 
loner: pressure ws rot : Remarks. 
: in mm. heart beat 
hrs. mins. secs, in mm. 
Normal 152 8-0 8 grammes per kilo. of body weight 
eet —— ne jugular vein ein. Injection 
lasted 1 nut 
0: 10:6 90 2-0 : 
0 12 0 94 2:0 | right and left vagi cut. No effect. 3 
0 13:20 94 20 | peripheral end peice vagus stimulated, 3 
pressure fell to 3 
0 22 0 116 2°5 
+ 70-0 40 7 
2, 380 41 7 
be Se 18 lees { 
1 56 0 14 less | dead a 
Shortly after introduction of the poison the vagus beats dis: 
appeared. Subsequent section of vagi produced n0 
effect. — 
Stimulation of peripheral end of right vagus stopped the > 
