Air, the only element for which the primitive tribes neglected to assign a deity, is the subject of Louis Wolfe's concise inquiry. The theory of atmospheric evolution and the discoveries of such scientists as Scheele bring the reader directly into contact with the properties of air, via an imaginary trip in an acroschaphe. What the air consists of, (its beneficial and dangerous properties) is carefully analysed. The effects of wind and electricity and the dangers of air pollution sum up this explanation.