26 Meissner’s Researches on Oxygen, Ozone, and Antozone. 
combustion may be removed by means of suitable absorbents; 
but the mist remains undiminished, and by passing it throu gh 
water is actually increased in density, Cold tobacco-smoke, 
when collected in a bottle, slowly disappears in a manner cor- 
responding to _ noticed in case of the antozone cloud obtained 
from electrized air. The water, which is an essential part of 
tobacco-smoke, comes partly from the tobacco itself, partly from 
the mouth of the smoker. It is a fact of common observation 
that the smoke which is blown from the mouth is much whiter 
and more opaque than’ that which curls from the end of the 
— and by retaining smoke in the mouth for a time, its density 
is increased. The fact that tobacco-smoke may be passed through 
water, as in the nargile, without losing its odor or narcotic 
effect, is due to the property of the antozone cloud to suspend 
and transport solid matters, which has already been pein 
Such are Meissner’s views, which certainly have very m 
probabilities in their favor, although they are not alto gedlele 
without further need of pusiesasinal confirmation 
In the third and last division os this work, the author oe 
cusses the Ozone and Antozone of the Atmosphere. He first re- 
views the observations of Halley, Kratzenstein, Saussure, and 
Forbes, regarding the physical structure of mist, and confirms 
the fact of its vesicular nature. He next discovers by experi- 
ment that while it is easy to condense moisture from any moist 
gas or gaseous mixture by cold or rarefaction, a ts impossible to 
produce a mist unless the gas is oxygen, or contains this element. The 
water condensed by are means from pure oxygen or from the 
atmospheric air always exhibits the character of a clond; that, 
separated from other asa | or mixtures free of oxygen, always 
assumes directly the form of rain. Where oxygen is present, 
the I 
Meissner states, further, that air saturated with moisture gives a 
cloud on sudden rarefaction until the pressure is reduced to about 
8 inches of barometric pressure. At this levity the cloud is, 
however, Enema a delicate and transitory, and under a less 
o cloud could be produced. This stand of the barom- 
eter i sisponds to a height in the atmosphere, above tide-level, 
of 27,000 feet. According to Kimtz, the lightest and highest 
clouds, cirrhi, are formed at an average altitude of 20,000, and 
test altitude of 24,000 feet. The densest artificial clond 
? Bermed 3 in the densest air, and - heaviest cumuli are formed 
within 5,000 feet from the sea-lev 
From these facts, Meissner “asa to adduce arguments in — 
favor of the view that all atmospheric clouds are really due to 
antozone, and consist of antozone in its union with water. We 
do not propose to follow the author through the details of his 
discussion of this physical part of his subject. We shall con- 
he 
al ie 
