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The danger is least in the case of chronic farcy, not only because the processes are less active, but because the virus is not being thrown out and diffused with the tidal air of respiration, sneezing, and coughing.

The condition also beguiles with a spray of mad moonlight and a whiff of tidal air.

This amount, less the tidal air, is known as the reserve air.

The air which is expelled from the lungs by a forced expiration, less the tidal air, is called the reserve, or supplemental, air.

This, less the tidal air and the reserve air, is called the complemental air.