560 Professor Dewar on Phosphorescence and Ozone. [June 8, '88. 



has two centres of stability, and one of them is at about the melting- 

 point uf platinum. In this experiment ozone is formed by the action 

 of a high temperature, owing to the dissociation of the oxygen 

 molecules and their partial recombination into the more complex 



Fig. 2. 



Ozone Apparatus. 



molecules of ozone. We may conceive it not improbable that some 

 of the elementary bodies might be foi-med somewhat like the ozone 

 in the whole experiment, but at very high temperatures, by the col- 

 location of certain dissociated constituents and with the simultaneous 

 absorption of heat. 



[J. D.] 



