CONTRIBUTION OF LUNG AIR TO TOTAL ORAL ODOR 547 the orM cavity did not mix with the air column moving from the lungs out through the nose, an analysis was made on three individuals who showed no odor when tested by the method described in lb. earlier in the paper. Table III shows the results of tests made on these individuals when the TABLE III--ADMIXTURE OF PLANTED ODOR IN THE MOUTH* (On Subjects Having Osmoscope Readings of 0) ,---Average Osmoscope Readings (In the Order Taken)---, Reserve Lung Reserve Lung Air (la.) Air (2a.) Mouth Odor Exhaled via Mouth Exhaled via Nostrils (lb.) Immediately prior to planted odor 0.0 0.0 0.0 Immediately following planted odor 4.0t 0.0 6.0t * Cinnamon Gum Bolus. p Odor of Cinnamon. odor of cinnamon was planted in their mouths. These data show that lung air directed through the oral cavity does pick up the odor in a short time (column 1, Table III). No transfer of a planted odor from the oral cavity into the air inhaled and exhaled through the nose was observed, (column 2, Table III) while the odor was immediately observed when the subjects inhaled and exhaled through their mouths (column 3, Table III). CONCLUSIONS 1. It is possible to isolate the air which has been in contact with the alveolar and bronchial processes and to subject this air to osmoscopic evaluation. 2. The transfer of odor components from the mouth surface into air passing over the oral interfaces is extremely rapid, probably in the order of fractions of a second. 3. The contribution to osmoscopically measurable odor by air which has equilibrated with alveolar and bronchial interfaces to the odor measured from the mouth of normal healthy individuals being tested using mouth odor analysis osmoscopic techniques is negligible. (Received January 2, 1964) R,.EFEKENCE$ (1) G. M. Fair and W. F. Wells, U.S. Patent No. 2,136,844 (1938). (2) C. J. Wiggers, Physiology in Health and Disease, 4th ed., Lea and Febiger, Philadelphia, 1944, pp. 384-389.

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