On the respiratory functions of the nose : and their relation to certain pathological conditions / by Greville MacDonald.

  • Macdonald, Greville, 1856-1944.
Date:
1889
Catalogue details

Licence: Public Domain Mark

Credit: On the respiratory functions of the nose : and their relation to certain pathological conditions / by Greville MacDonald. Source: Wellcome Collection.

Provider: This material has been provided by King’s College London. The original may be consulted at King’s College London.

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    Other, and finally exhausts the bell-jar. The latter is held by an assistant during the ex- periment over a bath of water sufficiently deep to allow of its complete submersion, and is allowed slowly to descend into the water as the air is exhausted ; thus the volume of air respired is accurately measured. Immediately before the experiment is made, the calcium-tubes (B, B, B) are weighed either together or severally. They are then replaced in the scheme, the tubes are so firmly fixed in the nose as to admit of no leakage, the mouthpiece is secured, and the assistant holds the bell-jar in contact with the surface of the water. A slow, deep inspiration through the mouthpiece gradually exhausts the bell-jar as it descends in the water. As soon as the thorax is full, the tubes entering the nose are firmly grasped, and that in the mouth removed and closed, before expiration is permitted through the latter channel. The process is then re-