104 Scientific Intelligence. 
Marignac also instituted a series of experiments on ozone produced by 
chemical means; air was made to pass through a long tube containing 
phosphorus, and thus it became sufficiently charged with ozone for the 
purposes of experiment. He found that perfectly dry air is incapable of 
generating this substance, and also that air freed from oxygen by pass- 
ing over ignited copper, produced no trace of it; but if a very little 
oxygen (insufficient to support combustion for a moment,) is present, 
ozone is produced with the same ease as inordinary air. Pure oxygen, 
nitrogen or hydrogen alone, do not produce it, but if a small quantity 
of oxygen is mixed with hydrogen, ozone is formed with great rapidity, 
on passing the mixture over phosphorus. 
Air impregnated with ozone looses entirely its characteristic proper- 
ties, if passed through a tube heated between 570° and 750° F. This 
principle is absorbed by water, but not by oil of vitriol, ammonia or 
chloride of calcium. If the air is passed through a solution of iodide 
of potassium, it loses its odor, and the salt is decomposed with the 
liberation of free iodine. Some iodate of — is also found in the 
solution. 
Ozone is readily absorbed . the metals. If the ozonized air is passed 
through a glass tube containing silver in a porous form, (from the de- 
composition of the acetate by heat,) it loses its peculiar odor, and the 
silver is converted into a blackish brown substance, which, when throwa 
into water, gives off oxygen gas with effervesence, and the remaining 
substance has all the characters of ordinary oxide of silver. 
These curious results, many of which were previously obtained by 
Schonbein, prove that nitrogen is not concerned in the formation of this 
substance, and seem to show that these —— reactions are seritet to 
oxygen in a loosely combined state. 
Mr. Williamson’s experiments confirm these dahavediic: and go to 
prove that it is a compound of oxygen and hydrogen. In. his experi- 
ments, the oxygen from the electrolysis of dilute sulphuric acid, was 
thoroughly dried by passing it over chloride of calcium ; the gas thus 
dried, was passed through a glass tube containing metallic copper, and 
heated to redness ; water, was formed abundantly and condensed in the 
cool part of the tube, and this formation of water continued as long as 
the process lasted. From this it appears that water is formed by the 
reducing power of the metal. To remove all sources of error, the oxy- 
gen was evolved from the electrolysis of a solution of sulphate of cop- 
per, in whose decomposition no hydrogen is set free, the oxygen thus 
been continued for two or three days, and when more than one fourth of the mee 
had been driven off in the form o koh eae, the oxygen was found to be as strongly im 
f the experiment. 
= pate — 
toe 
