Ozone and the Atnnosphere. 



215 



ment the amount was extremely small, and no fumes were 

 apparent. 



OZONOSCOPES WITH NITROUS FUMES (INVISIBLE). 



OZONOSCOPES. 



1— " 



DBX. 



MOISTENED. 



20 MINUTES 



ONE HOUR 



TURNED AFTER 

 12 HOURS 



KI 



Yellow (1) 

 Unaltered 

 Light brown (4) 

 Unaltered 

 Light lilac (3) 

 Unaltered 

 Reddish (5) 

 Unaltered 



Light brown 

 Unaltered 



Greenish (2) 



Unaltered 

 Light brown (6) 

 Faint lilac (7) 



Slightly bleached (8) 









Moffat 



(1) Dark brown 



(2) Brown 

 (4) « 



(3) " 











Little changed 

 Reddened ' 





(noKI) 

























OZONOSCOPES WITH SULPHUROUS ANHYDRIDE. 



OZONOSCOPES. 



DBY 



MOISTENED 



SAME AFTER 12 HOUES 





Red 



Yellow red 



Turned brown? 















A little bleached ? 



The rest unaffected 





OZONOSCOPES (AFTER OZONIZING) WITH SULPHUROUS 

 ANHYDRIDE. 



(1). Potassium iodide and all the iodo-starch papers bleached. 



(2). Thallium, after having been ozonized to a dark-brown, 

 is bleached. 



(3). Manganese Sulphate and Acetate remain intensely 

 brown. 



(4). Guaiacum, Alizarine, and Houzeau test, little affected. 



Carbonic anhydride had no effect on the ozonoscopes, either 

 before or after ozonizing. 



