One of the constant features of respirationthe exhalation of carbon dioxide can still be observed.
The entry of gases into, and exit from, the cells, as well as the actual exhalation of watery vapour from the latter, take place in the intercellular space system of which the stomata are the outlets.
If this exhalation is stopped or lessened the digestion in its turn is also stopped, the leaf remains longer than usual in the intestines, the microbes multiply, invading the whole body, and this brings about the sudden death which surprises the rearers.
Baldwin Latham made an elaborate examination of the meteorological conditions, and more particularly of the vapour tension, from which he draws the conclusion that the seasonal variations are due to exhalation from the ground.
It is marked by the constant and continuous absorption of a certain quantity of oxygen and bythe exhalation of a certain volume of carbon dioxide and water vapour.
After the disastrous defeat of Leipzig (r 7th-19th Dctober 1813), when French domination in Germany and Italy -vanished like an exhalation, the allies gave Napoleon another opportunity to come to terms. The overtures known as the Frankfcrt terms were ostensibly an answer to the request for information which Napoleon made at the field of Leipzig.
This process, which is as yet imperfectly understood, is attended by the consumption of oxygen, the liberation of energy in the form of heat, and the exhalation of carbon dioxide and water vapour.
Life is maintained by the inhalation of fresh atoms to replace those lost by exhalation, and when respiration, and consequently the supply of atoms, ceases, the result is death.
These show that a definite intake of carbon dioxide is always accompanied by an exhalation of an equal volume of oxygen.