OXIDATION AND AIR
Relative importance of air, food and water
One of the most important of the vital functions is breathing. Physiologists, teachers, and lecturers continually remind us of the comparative time we could live without food or water, and the remarkably short time we could live if entirely deprived of air.
Oxygen not the only required element in breathing
Oxygen is vitally necessary for the purpose of purifying the blood and supplying the various tissues and fluids in the body, of which oxygen forms an important constituent. However, oxygen is not the only necessary element which is utilized by the system in the process of breathing, as human beings die immediately upon being placed in a receptacle of undiluted oxygen. Just what this other factor is, science has not clearly defined, but that it is concerned with rest and sleep we have at least unconsciously recognized, as shown by our often referring to periods of rest as "breathing spells"; from the fact that we have found it of great importance to keep the air we are breathing moving constantly about us, especially while asleep. From all these facts we are forced to believe that sleep plays an important part in producing and maintaining body-energy, besides constantly recharging the system with oxygen.