AND OTHEE PHENOMENA OP EESPIEATION. 
709 
in further confirmation, it is remarkable to notice how frequently the evolution of carbonic- 
acid increased on the Monday, after the rest and retirement of the preceding day.] 
III. INPLHENCE OP WALKINO AND THE TEEAD WHEEL. 
The only experiments which I have been able to make in reference to exertion are 
limited to the infiuence of walking and the treadwheel, 
1. Walking. 
I employed two sets of the apparatus, and attached them to the mouthpiece by a long 
tube, partly of glass and partly of vulcanized india-rubber, so long as to enable me to 
walk about 11 yards in each dnection. The distance was accurately measured, and the 
speed regulated with the watch in hand in the most exact manner. I also walked at 
the same speed for some time before the experiment began, so as to bring the body to 
the full infiuence of the increased action. The results are given in detail in Table VIII. 
Table VIII. 
Showing the influence of Sleep and Exertion. 
Date. 
Hour. 
Carbonic 
acid, 
per min. 
Air, 
per min 
Pulse, 
per 
min. 
Eate 0 
respi- 
ration 
per 
min. 
f| 
Temperature. 
Wet. 
Dry. 
July 15 A.M. 
July 16 A.M. 
A..M. 
h m 
1 30 
2 35 
6 45 
1 0 
3 0 
grs. 
6-7 
5- 94 
6- 1 
4-88 
4-99 
cub. in. 
66 
70 
67 
71 
69 
71 
1 Whilst awake, but after lying down for some hours, 
1 and -with every approach to sleep. 
In slee'p, but probably not profound. 
In sleep. 
July 15 p.M. 
p.M. 
3 30 
4 30 
181 
25-83 
799 
1028 
90 
14-5 
16 
72-5 
75-5 
Walking at 2 miles per hour. 
Walking at 3 miles per hour. 
Oct. 8 p.M. 
Oct. 9 
Oct. 22 
p.M. 
4 0 
3 30 
3 4,54 
3 464 
3 4?! 
3 49 
3 50 
3 51 
3 52 
3 53 
3 54 
3 55 
3 66 
3 57 
3 58 
3 59 
4 0 
43-36 
42-9 
j 9-14 
48-66 
1120 
930 
720 
r 680 
590 
[ 600 
540 
590 
530 
r 560 
1 540 
500 
r 560 
1 620 
150 
150 
102 
150 
22 
21 
21 
18 
17 
17 
16 
15 
15 
16 
15 
15 
15 
15 
15 
15 
20 
r Treadwheel ; 43 steps, ascending 28-65 feet per minute. 
I I was on the wheel 4 of an hour, and determined 
1 the carbonic acid for 3 minutes after 5 minutes, and 
i the last 2 minutes of 15 minutes. 
f Treadwheel. Determined the carbonic acid during 3 mi- 
1 nutes after 5 minutes, and 2 minutes after 10 minutes. 
\ 
Tiest after treadwheel. 
I sat down directly, and after ^ a minute used the 
spirometer. Another 4 minute was lost after 34 
minutes. 
. The carbonic acid was collected— 
During 3 minutes after 4 minutes. 
During 2 minutes after 10 minutes. 
During 2 minutes after 13 minutes. 
7 minutes. 
r Dined on prison fare at 24 p.m. ; soup and bread. 
Treadwheel, 40 to 44 steps per minute. Carbonic acid 
[ taken three times in the last two of each 5 minutes. 
