AJSTD OTHEE PHENOMENA OF EESPIEATION. 
693 
Mr. Moul. 
iEt. 48. 
5 feet 9|- inclies high. 
173 lbs. weight. 
6-735 oz. 
Myself. 
Professor Frankland. 
m. 39. 
6 feet high. 
.Et. 33. 
196 lbs. weight. 
5 feet lOJ inches high. 
Vital capacity 270 cub. in. 
136 lbs. weight. 
7-85 oz. 
5-6 OZ. 1 
Dr. Murie. 
Mt. 26. 
5 feet 7|- inches higli. 
133 lbs. weight. 
Vital capacity 250 cub. in. 
6-54 oz. 
In myself the proportion of carbonic acid evolved per hour during the night of six 
hours, is to the day as 1 to 1-8,— a proportion which differs somewhat from that which 
ScHAELiXG found with nine hours’ rest. 
There yet remains for determination the influence of exertion. There are not on 
record any experiments in reference to the influence of exactly defined degrees of 
exertion, except that of raising certain weights through a given space in a given time ; 
but Regxault, Yierordt, and others have ascertained in a general way that exertion 
increases the respiratory changes. I shall again refer to this subject at a future page. 
Whilst walking at two miles per hour during three-quarters of an hour, and carrying 
the spirometer, weighing 7 lbs., I expired 18-1 grs. of carbonic acid per minute, and 
25-83 grs. when walking at three miles per hour. These quantities represent 1-85 and 
2-64 times that of quietude in the sitting posture. Hence if three hours were spent in 
walking at two miles per hour, and one hour at three miles per hour, as is probably the 
case with the non-laborious class ( 2 ^ hours in the standing posture having been introduced 
into each of the two continuous inquiries above recorded when at rest), the addition to 
the daily quantity of carbonic acid evolved will be 2463 grs.; and it is probable that 
thrice that quantity would be applicable to the really laborious class. It is true that 
these are probabilities and not demonstrations ; but if it be desirable to determine the 
daily amount of carbonic acid evolved by the community, it can only be effected by 
dividing them into classes, and determining the precise influence of certain agents during 
their period of action. 
These quantities give the following- total average results in the twenty-four hours : — 
In quietude .... 26-193 oz. of carbonic acid = 7-144 oz. of carbon 
Non-laborious class . . 31-824 oz. of carbonic acid = 8-68 oz. of carbon 
Laborious class ... 43 oz. of carbonic acid =11-7 oz. of carbon, 
or a general average of 33-67 oz. of carbonic acid and 9-18 oz. of carbon. 
As some of the elements in this calculation apply to myself alone, viz. those in 
reference to sleep and exertion, it may be of interest to determine my average apart 
from that of those who were conjoined with me in some parts of tlie inquiry. Thus, 
In quietude 28-8 oz. of carbonic acid = 7-85 oz. of carbon 
As a member of the non-laborious class 33-43 oz. of carbonic acid = 9-11 oz. of carbon 
As a member of the laborious class . 45-7 oz. of carbonic acid = 12-19 oz. of carbon, 
or a total average of 35-97 oz. of carbonic acid, and 9-72 oz. of carbon in the twenty-four 
hours. 
I do not know how to compare these results with those given by previous observers, 
