PHYSICAL AND CHEMICAL AGENTS UPON BLOOD. 
695 
( c ) Ox-blood with 100 per cent, of air, twenty-four hours’ action at 38° C. 
No. 14. — In 100 parts of air. 
Oxygen . . . 
Carbonic acid . 
Nitrogen . . 
22-4o} T ° tal oxygen 22 ' 40 
77-60 
Result : — 
The amount of carbonic acid exhaled in this case seems very extraordinary, neverthe- 
less I believe that it is perfectly correct, for another portion of the same blood, used as 
a controlling experiment, yielded to within a fraction of the same amount of carbonic 
acid. The fraction of difference, too, was an excess, being 22-6 instead of 22*4. Thus 
24 hours at 38° C. Result: — 
No. 15. — In 100 parts of air. 
Carbonic acid =22* 6. 
As the weather was exceedingly foggy at the time these experiments were made, it 
was deemed advisable to analyze the fog in order to ascertain how much carbonic acid 
it contained, lest the extraordinary results obtained in the last two experiments might 
be due to that cause, or to some disease in the blood. 
No. 16. — Result of an analysis of fog in 100 parts of air. 
Carbonic acid =0-52. 
This is the greatest amount of carbonic acid 1 ever obtained from London fog, and 
large though it be, it is still far too small a quantity to account for the results in the 
last two cases. 
By placing the different effects of temperature in a tabular form, the influence exerted 
by that factor over the chemical changes occurring in blood will be still better appreciated. 
Defibrinated ox-blood. 
Oxygen. 
Carbonic acid. 
Nitrogen. 
Temperature 0° C. 24 hours 
17*43 
00-59 
81-98 
„ 12° C. „ 
12*54 
02-77 
74-69 
„ 38° C. „ 
00-00 
22-40 
77-60 
The influence of temperature on the interchange of gases is equally well illustrated by 
comparing the results of experiment 13 with that of experiment 10, when it will be 
seen that 3J hours’ action at a temperature of 38° C. (the temperature of the animal 
body) yields much more carbonic acid than 24 hours’ action at a temperature of 12° C. 
100 per cent, of air with ox-blood. 
Oxygen. 
Carbonic acid. 
Nitrogen. 
24 hours’ action at 12° C 
12-54 
2-77 
74-69 
3i „ „ 38° C 
18-80 
4-07 
77-13 
The effect of temperature on the individual constituents of the blood was also studied, 
mdccclxv. 5 D 
