PHYSIOLOGICAL ACTION OF VENOM OF BLACK SNAKE, 261 
jugular vein. In some cases the vagi were previously severed, 
in others left intact, or cut during the course of the experiment, 
Graphic records were obtained in each case, both before and 
after the injection of the poison, and these curves have been 
measured and the numbers tabulated. Opposite the time 
indicated in the first column are placed the amplitude of the 
respiratory excursion of the tambour-lever, and the number 
of respirations per minute, together with the blood pressure 
for the time being. 
(a)—Observations on the respiration after subcutaneous injection 
of the poison. 
Experiment 1—Rabbit, 1-6 kilos, ; vagi intact. 
Time, ___ Respiration. ie 
Amplitude| Rate per pong Remarks. 
hrs. mins. secs.) inmm. | minute. | i#™m 
CAAT MR ee 
Normal 17 68 106 ‘005 gramme per kilo. injected 
under skin of abdomen 
0 15 0 15 84 106 
0 30 0 10 68 101 
0 45 0 9 32 6 
Sh a Be ae 28 95 
7-6 01m 21 108 _| large slow cardiac contractions 
(vagus) 
0 Or 4 28 96 
2 15 0 12 32 91 
= 80. 0°) TN 36 86 
cw 9 |S 33 92 
a0 0 2°5 24 113 | large slow cardiac contractions 
3 5 20 112 ditto 
a7 0 os 101 ditto, slight convulsions 
<Ssie 68 dit convulsive inspiratory 
3 movements _ 
23 0 : 33 di occasional inspiratory 
a9 | 0 0 16 | dead 
