4287. Under what circumstances does carbon most readily unite with oxygen?
4288. 1. When its temperature is raised: thus, if carbon be red-hot, oxygen will most readily unite with it; and 2. When it forms part of the fluid blood.
4289. Why do oxygen and carbon so readily unite in the blood?
4290. Because the atoms of carbon are so loosely attracted by the other materials of the blood, that they unite very readily with the oxygen of the air inhaled.
4291. Is carbonic acid wholesome?