Carbonic acid in medicine / by Achilles Rose, M.D. ; with the portraits of van Helmont, Priestley and Lavoisier.

  • Achilles Rose
Date:
1905
Catalogue details

Licence: Public Domain Mark

Credit: Carbonic acid in medicine / by Achilles Rose, M.D. ; with the portraits of van Helmont, Priestley and Lavoisier. Source: Wellcome Collection.

Provider: This material has been provided by the Francis A. Countway Library of Medicine, through the Medical Heritage Library. The original may be consulted at the Francis A. Countway Library of Medicine, Harvard Medical School.

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    Paul Bert, Herter, and Huefner—have found by their experiments that the tension of oxy- gen in the arterial blood at the normal tempera- ture of the body is equal to an oxygen partial pressure of 7S-8o mm. of mercury. The ten- sion of the oxygen of the air in the lungs was compared with these figures. Numerous investigations in regard to the composition of the inspired atmospheric air as well as the air of expiration have been pub- lished. These two kinds of air have on an average, at o C. and under pressure of 760 mm. of mercury, the following composition ex- pressed in volumes per cent.: Oxygen. Nitrogen. ^^^^^^^^^ Atmospheric air 20.96 79.02 0.03 Air of expiration 16.03 79-59 4-3^ The partial pressure of the oxygen in the at- mospheric air—the barometer having the aver- age 760 mm.—corresponds with a pressure of 159 mm. of mercury. The loss in oxygen which the air of inspiration sustains during respiration is therefore 4.93 per cent., while
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