OTHEK PHENOMENA OE EESPIEATION. 71 3 
The penod of permanent decline in the carbonic acid is May and June, in different 
persons, and at the period of minimum quantity there is the greatest uniformity 
Temperature moves in advance of the caibonic acid, and particularly as it declines. 
. All respiratory- phenomena vary with the season, and hence it is better to adopt 
comparative rather than absolute quantities-the comparison being with the state M 
rest, \vitli 01 without food ; but the latter is the most reliable. 
^th^thr\°t^^f^^f compared, 1st, ivith the average state of rest with food, and 
is^as foUows :-a two miles per hour, one hour is equal to If hour with food, and to 
, ours withou food. At three miles per hour, one hour to 2f hours and to 3^ hours 
ne horn- of the laboui- of the treadwheel, whilst actually working the wheel, is equal to 
acid to the mspu-ed air is much greater with exertion than at rest; and it increases as 
e speed, m a progi-ession of one-ninth of the quantity at rest for two and three miles 
per hour without food. 
16. The proportion of the carbonic acid to the inspired air is greater without than 
™th food, and m summer than in winter. It is not absolutely uniform at any time, 
and it diners in different persons. ^ 
Men differ in every subject which has been investigated. 
In conclusion, I beg to offer my warmest thanks to Mr. Moul, to Professors Feahk- 
LA.ND, Platfaie, Shaepev, and WILLLAMSOII, and other gentlemen who have aided in 
these and other inquiries. 
Explanation of the Plates. 
PLATE XXXIII. 
Fig. I. Shows the quantity of carbonic acid evolved per minute, with and without food, 
in contrast, and also the effect of the supper on March 12, as contrasted with 
the absence of that meal on May 15. The observations delineated in the 
morning of the day of fasting in J uly followed, and did not precede those 
represented in the afternoon. 
Fig. 2. Eepresents the daily diminution in the quantity of carbonic acid per minute, 
with sudden increase in temperature in April 1858. The diminution in the’ 
quantity of am inspu’ed by Mr. Moul is also stated on each day. 
Fig. 3. Exhibits the same fact in two other aspects, viz. the quantity of carbonic acid 
m decimals of grains per minute to each degree of temperature, and also the 
dimmution in the expiration of carbonic acid in decimals of grains per minute 
for each degree of temperature above that which occurred immediately before 
the increase of temperature took place. 
MDCCCUX. c y, 
