A HARD-WORKING DIET. 43 
(6.) Or from a compound that readily gives up 
its O, (p. 7), which admits of oxidation being 
made to take place in a closed vessel. 
(c.) Or, as in the body from the blood where the 
O is mainly conveyed in the corpuscles. 
3. The results of the oxidation of C and H within 
the body are carbonic acid and water, just the same 
as if they were oxidized in a candle or lamp. 
4. That C and H when oxidized, as all the ele- 
ments (except fluorine) do give rise to heat, often 
accompanied by light. 
5. That the oxidation of C and H in the body 
give rise to heat and force, but not such heat as to 
give light. 
6. That the results of the oxidation of C and H with- 
in the body (the carbonic acid and the water) are, with 
small exceptions, (p. 22) carried away from the place 
of oxidation by the blood to the lungs, which, while at 
each inspiration supplying fresh O to the blood, at 
each respiration relieves it of some of its CO. and H,O. 
7. That the amount of CO given off by the lungs 
is therefore a nearly exact measure of the amount of 
C oxidized. 
8. That the result of many careful experiments in 
collecting and weighing the amount of CO, given off 
at different times shows that more is given off during 
hard work than during light work. 
9. Whether the carbon is being oxidized at a rapid 
or slow rate, the supply whether immediately used up 
or stored has to be furnished by the blood to the parts 
where it is wanted, and the blood receives it from the 
stomach and associated parts, which, in their turn, 
obtain it from the foods. 
