ON OZONE. 93 
gard to the smell of the air and the electro-motive power of the latter. The 
former will resemble the electrical smell, and the air will now be able to po- 
_ larize negatively gold or platinum. 
3. Atmospheric air completely deprived of its moisture and put in contact 
with phosphorus, does not give rise to the production of the electro-negative 
principle. 
4, Atmospheric air, which contains only small quantities of the vapours of 
zther, alcohol, olefiant gas, sulphurous acid, nitrous acid, sulphuretted, phos- 
phuretted or seleniuretted hydrogen, is not ‘capable of developing the elec- 
trical smell, or assuming the state of the electro-negative polarity. 
5. A mixture of oxygen and carbonic acid, or of oxygen and hydrogen, 
acts with regard to phosphorus like the common air, or an artificial mixture 
of oxygen and nitrogen. 
6. Pure oxygen, or nitrogen, or hydrogen, or carbonic acid gas, whether 
moist or anhydrous, being placed i in contact with phosphorus, becomes posi- 
tively polarized ; but none of those substances produce our electro-negative 
principle or the electrical smell. 
7. To generalize the circumstances under which phosphorus is prevented 
from generating the said principle, it may be said that anything that stops the 
slow combustion or the emission of light of phosphorus at the common tem- 
perature, also renders impossible the development of the electrical smell, whilst 
the latter is always produced in an atmosphere in which phosphorus exhibits 
in the dark the phenomenon of a lively emission of light. 
8. The positive polarity and alliaceous odour assumed at zero by common 
air in contact with phosphorus, is most likely due to the vapour of that body, 
whilst the negative polarity and the electrical smell developed at a higher 
temperature in the same air, originate in that peculiar principle, which, on 
account of its strong odour, I have called ozone. 
As far as my experiments go they show that ozone enjoys the following 
_ properties :— 
a 
1. Stripes of blue litmus paper, being plunged into an ozonized atmosphere, 
are within a very short time completely bleached without being reddened 
in the least degree. Stripes of paper, having been coloured blue by a solu- 
tion of indigo, and placed under the same circumstances, turn white. A 
solution of indigo or of litmus, being shaken with an ozonized air, loses also 
its colour exactly in the same way as if the solution had been treated by 
chlorine. 
2. Most metals, silver even not excepted, being in a state of minute me- 
chanical division and put in contact with ozone, almost instantaneously de- 
stroy that principle at the common temperature. Silver being changed 
under the circumstances into a compound containing nothing but metal and 
oxygen, it seems that the other metals are also oxidized by ozone. 
3. Iodine put into an ozonized atmosphere is changed into iodic acid. 
4. Powder of charcoal very rapidly destroys ozone. 
5. Phosphorus quickly takes up ozone, being transformed into phosphoric 
oe 
6. Sulphuretted, seleniuretted, phosphuretted, carburetted, and ioduretted 
hydrogen rapidly destroy ozone, and are themselves decomposed by that 
principle. 
7. Sulphurous acid and ozone being mixed together disappear and produce 
Malpdniric acid. 
8. Nitrous acid and ozone destroy each other with instantaneous quick- 
hess, producing nitric acid. 
~ 9. A number of metallic protoxides being put in contact with an ozonized 
