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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    all sources of heat except that of the air passing through the tube. Next an observa- tion is taken of the atmospheric temperature, and, after a full expiratory effort, the ap- paratus is fixed with the nipple (B) in one nostril and the rubber tubing (C) in the mouth. Through the latter the air is in- spired, and is immediately felt rushing in at the open nostril. That no air passes from the nose into the pharynx is proved by closing the rubber tube with the finger and thumb, when respiration is immediately stopped, it thus being manifest that the inspired air traverses only the area comprised in the two nasal fossae. Expiration must be performed through the mouth while the mouthpiece is removed, the latter being tightly held, not only to exclude cold air, but as an additional safeguard against expired air passing through the nose and so over the thermometer. I employed at first a valvular arrangement that automatically permitted of