176 Proceedings of Imhana Academy of Science 



tion and to cause fo.e,' formation". In working with pure oxygen it is 

 possible to secure conditions such that a slight fog is produced on ab- 



^ 2 



I 



IZ 



1^ 



Xo 



L/ters per /Yoc/r 

 Fig. 1. Formation of nitric acid, ozone and fosr in air at 4G0mm. pressure in 

 a very large dii^charsre apparatus at more than 50,000 volts. The nitric acid curve is 

 Kivcn as fiprure 8 by Haidintc and McEachron. cit. ",. The other curves have not been 

 published. 



5^ 



\ 



^ 



I tiers joer /%/> 

 FiK. 2. The same tube was used as in (i.ururc 1, but the iiressure of the air was 

 ifiOmm. ; cf. figure 9, cit. ". 



.sorbing the ozone in potassium iodide solution. But the fog produced 

 by the ozone alone was a very small part of the total observed. That 

 leaves the nitrogen pentoxide which is, like sulfur trioxide, a very hygro- 



' Prin.cral. Ann. Physik. 26. 727 (1908). Prin.iral's exiilanation is obviously wrong 

 because ozone will not react with unactivated nitrogen, cf. Biober. ibid. 39, 1.313 (1912). 



