Tlie Frodiiciion of Fcrccide of Hydrogen. 21 



Tahlc ^liotoing tlie effect of Temperature upon the Hydrogen Per 

 oxide and Ozone contairted in Air ozonized by Phosphorus. 



Exp. 



Temp. 



Water. 



HoO.2. 



Ozone. 



1st Series - 



I 



II 



III 



100^ 

 50" 

 24° 



0.0015 grm. 

 0.0010 " 

 0.0000 " 



0.0028 grm. 

 0.0019 " 

 0.0000 " 



not determ. 



2d Scries - 



IV 



V 



VI 



200° 

 200° 

 150° 



0.0010 " 

 0.0011 " 

 0.0002 " 



0.0019 " 

 0.0020 " 

 0.0004 " 



0.000 grm. 

 0.000 

 0.0011 " 



3d Series-] 



VII 



VIII 



IX 



100° 

 50° 

 21" 



0.0015 " 

 0.0003 " 

 0.0000 " 



0.0028 " 

 0.0006 " 

 0.0000 " 



0.0013 " 

 0.0044 " 

 0.0037 " 



4th Series < 



X 



XI 



XII 



200° 

 100° 



22° 



0.0018 " 

 0.0002 " 

 0.0000 " 



0.0034 " 

 0.0004 " 

 0.0000 " 



0.0000 " 

 0.0011 " 

 0.0051 " 



Thess experini iits, it appears to us, coiiclasively establish the 

 truth of the first, second and fourtii propositions. They show 

 tliat both hydrogen peroxide and ozone are formed, and that on 

 heating the ozonized air, the proportion of water thus formed 

 regularly increases, while that of the ozone as regularly dimin- 

 ishes, until at 200° all the hydrogen peroxide is converted into 

 water, and all the ozone into ordinary oxygen. 



At the close of the twelfth experiment, the intermediate train 

 of dryers, etc., was thrown out, and the Geissler bulb W, con- 

 taining tlie 23otassium iodide solution, was connected directly 

 with the first wash-bottle (that preceding F). The same volume 

 of ozonized air, at the same rate, being drawn over under these 

 conditions, gave a result corresponding to 7.94 mgrms., instead 

 of 5.1 mgrms., as in experiment XII. The difference of 2.84 

 mgrms., which is 36 p. c. of the amount of ozone originally 

 evolved, represents the loss due to the decomposition effected 

 by the simultaneous presence of hydrogen peroxide. 



This establishes the second proposition, and shows not only 

 that the hydrogen peroxide and ozone can cc-exist for a long 



