Old And New

Cover Old And New
Old And New
Edward Everett Hale
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It is doubtless also due, in part, to the decarbonising action exerted by large masses of living ver- dure upon the lower strata of air.
Id all the above statements refer- ence is had to ,the volume, not to the weight, of the gases.
Ewj Carbonic Acid affects Health, — Good ventilation implies that the air shall not contain more than seven hundred parts per million of this gas.
But the injury done by the presence of excessive amounts depends on many circumstances. Animal exhalations are more dis
...tressing, sometimes, than carbonic acid ; for we are quite com- fortable in winter, in places which in- summer oppress us, unless the ven- tilation is increased. In sleeping, it is of advantage to reduce the quantity of oxygen a hundred or two hundred parts in the million. The habits of men and animals illustrate this fact, and suggest that it has become an in- stinct, as it were, to correct the stimu- lus of pure oxygen by increasing the amount of carbonic acid, which, of course, is accomplished by simply con- suming part of the oxygen.

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