A HARD-WORKING DIET. 373 



(b.) Or from a compound that readily gives up 

 its O, (p. 337), 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. 352) 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 2 and H 2 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 2 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. 



