348 CO, Capacity of Blood. II 
In the third experiment is afforded an example of extremely 
bad light etherization, yet which was not so bad as to cause early 
death from failure of breathing (apnea). The excessive breath- 
ing reduced the CO, content of the blood progressively and the 
COz2 capacity followed downward with the usual lag until at a 
CO; capacity of 28 the animal was moribund. It died soon 
after. 
Experiment 3.—Dog, male, 14 kilos. Prolonged ether excitement. 
Equilibrating air 5.4 per cent CO. 
Rosca Blood CO:. 
Time. Condition. tions per 
one Content. | Capacity. 
vol. per cent| vol. per cent 
9.20 a.m. Normal. 19 54 aa 
o730)5, Ether started. 
10.00 “ : 63 44 52 
10:30 5: 82 39 44 
100g: 70 36 43 
1YS057* 78 37 44 
1200 = 42 36 41 
12so0ue | 84 35 39 
1.00 p.m. 59 37 38 
1307 76 31 - 36 
ae) es 56 22 37 
Dolla. 59 24 31 
3.00 77°" 82 ot 28 
o.l0 7s: Moribund. Ether stopped. 
Fat ead Stopped breathing. 
3.24 “ Heart stopped. Dog dead. 
In the fourth experiment the same procedure was followed until 
the CO, content had fallen at the end of 210 minutes to 35 volumes 
per cent and the CO, capacity to 38. The administration of ether 
was then stopped, and in the course of the succeeding 90 minutes 
the COs, content rose again nearly to normal and thereby caused 
the CO, capacity to rise to 46, only a little below the normal 
level. 
