upper air

It is to be remembered, however, that a few of these bacteria may reach the sputum from the upper air-passages.

It floated out upon the night, over the housetops, the crescent of the river, losing itself in the silence of the upper air.

Once more Gwynne gazed down upon the sleepless city, where the lights seemed to powder the upper air with gold dust.

This is equipped with delicate instruments in considerable variety for the study of varying conditions of the upper air.

An eagle floated serenely on the upper air currents, automatically adjusting himself to their constant changing.