220 C. J. MARTIN. 
those experiments which lasted some hours, a continuous res 
was not taken, but the kymograph was stopped and set going 
again for a few minutes, at intervals of fifteen or thirty minutes 
or less as occasion demanded. In tabulating the curves, the 
height of the pressure tracing at any particular moment above the 
abcissa was measured in mm. and this number doubled. In every 
case the mean pressure between the limits of the respiratory and 
cardiac undulations was taken. 
(1) Experiments with dogs in which the vagi had been previously 
severed. 
Experiment 1—Dog, weight 4:1 kilogrammes, ‘065 gramme of 
morphia injected hypodermically ; ether during operation. 
Sra a “ae sade 
hrs, mins, secs mercury = 
f 4 
n gacenn of 0002 gramme per kilo. 0 
cue <i a eight into the external jugular vel 
tageetidu lasted 5 minutes. 
O:.. 5: 30 122 
0 10 0 104. 
OS 0 72 
0 30 0 82 
0 45 0 118 
pts | SN 1 98 
Beas te | 78 
1 30 0}, 65 
1 45 0O 37 
2230 @ 30 
Zoe O 34 
2 4 O 15 
Bo OO 13 | 
ace 18 ‘dead _ 
eens Re ee ott $e % 
xpépligans a Toe, weight 3:4 bce, 065 gramme morphia : 
hypodermically ; ether during operation. 
Time, v 
me ra Pm ap Remarks. 
hrs. mins. sees.) mercury. ¢ mcmmeremermere = 
of -001 mme per 
Normal 124 beer ete ‘oni pa ffeil 
3} minutes. 
02° S80 48 
0. 5-0 34 
0 8 0 44 dyspneic struggles 
0:10 6 14 
eet ee 10 dead shinee 
