AND SCHONBEm 53 



negative polarity, and, in fact, all the properties of 

 ozone already specified disappear. If you take a 

 piece of phosphorus which would not shine in the 

 dark or colour a piece of my test paper placed near 

 it, and hold it near a point from which electricity is 

 being discharged, no ozone is developed at the point, 

 starch paste containing potassium iodide is not turned 

 blue, and generally none of the phenomena which I 

 have described as accompanying the electrical brush 

 are observed. Are we then to suppose that voltaic 

 and electric ozone are different from that which is 

 prepared from atmospheric air by means of phos- 

 phorus, and that chemical ozone cannot combine with 

 phosphorus ? 



As a fact there is no such difference, as the follow- 

 ing experiment shows. If a few drops of ether are 

 allowed to fall into a flask filled with chemical ozone, 

 and then a small piece of phosphorus added, the ozone 

 smell rapidly disappears, and the test paper is no 

 longer turned blue by the air in the flask. The ozone 

 already present in a flask containing air and phos- 

 phorus is always destroyed, if by any of the means 

 which I have described, or in any other way, the 

 luminescence of the phosphorus is checked, that is, 

 its slow combustion prevented. To this, therefore, 

 is attributable the fact that the voltaic condition of 

 the air above the phosphorus can be repeatedly 

 altered, and depends essentially on the temperature ; 

 so that this air is sometimes positive, sometimes 

 negative, and sometimes neither. I may mention in 

 passing, that according to my experiments the 



