Note 28 — IV.

Ozone, or oxygen in an allotropic condition, is found in more perceptible quantity in pure localities than in those where great quantities of putrescent substances are accumulated, as the ozone disappears by oxidation. Observations on the quantity of ozone contained in the air during an epidemic are, therefore, of great interest, because they may throw a light on the influences of the atmosphere in the propagation of certain diseases.