415 
of Edinburgh, Sessio7i 1864-65. 
The signs placed over the bracket merely denoting that H 2 OO as 
a whole is to be considered as an electro-positive compound, and 
000 as electro-negative. 
This view of the constitution of ozone is due to Professor Odling 
(Manual of Chemistry, 1861), and the most important argument 
in its favour is the non-diminution in volume of ozonised oxygen 
when the ozone is decomposed by iodide of potassium or mercury 
(Joe. cit. p. 94). 
The existence of antozone has been fully established by the 
experiments of Schonbein and Meissner. 
The latter has shown that when electric discharges are passed 
through dry oxygen, another substance, antozone, is produced 
besides ozone. If the latter be destroyed by passing the electrised 
oxygen through a strong solution of iodide of potassium, antozone 
remains mixed with ordinary oxygen. 
The properties of antozone can thus be observed. One of the 
most characteristic of these is the formation of a thick white mist 
when passed into water. This same white mist is also formed 
when the gas produced by the action of concentrated sulphuric acid 
on peroxide of barium is passed into water. In the latter case, 
therefore, antozone is produced, and not ozone (as stated by 
Houzeau). 
Now, on examining the characters of antozone as far as they 
have hitherto been observed, we find that, instead of being comple- 
mentary to those of peroxide of hydrogen, as in the case of ozone, 
they correspond with them very closely. In other words, where per- 
oxide of hydrogen acts as a reducing agent, antozone does so also. 
Thus a paper moistened with sulphate of manganese, and coloured 
brown by ozone, is again decolorised by antozone, owing to the 
reduction of the peroxide of manganese at first formed to the state 
of protoxide. Peroxide of manganese is also reduced by peroxide 
of hydrogen. 
Similarly, a paper moistened with subacetate of lead, and dis- 
coloured by ozone, is again whitened by antozone, owing to the 
reduction by the latter of the peroxide of lead first formed to prot- 
oxide of lead. Peroxide of lead is also reduced by peroxide of 
hydrogen. 
Similarly, dilute acidulated solutions of bichromate and perman- 
