112 APPENDIX 



reconvert oxylized into ordinary oxygen, since isolated 

 ozone is changed by heat into ordinary oxygen just as 

 the peroxides are reduced to the oxides under the same 

 conditions, the oxygen, thus separated, appearing in its 

 normal condition, and as the first hydrate of nitric acid 

 splits up into N0 2 , HO and 0. The separation of a 

 portion of nitric acid would in that case be due to the fact 

 that only a definite amount of ordinary oxygen is capable 

 of uniting with H, Pb, Mn, etc. If 6 in PbO is con- 

 verted into by the action of heat, then the oxygen 

 would split off, for PbO can remain united with 6 but 

 not with 0. According to the nature of the compound 

 RO, with which is combined, it requires a smaller or 

 greater amount of heat, to effect this change of into 0, 

 or its separation from KO. 



In the case of HO this change takes place at moderate 

 temperatures, whereas lead peroxide requires a greater 

 heat and MuO a still greater. 



As far as chlorine, bromine and iodine are concerned 

 regarding them as peroxides the highest temperatures 

 which we have as yet succeeded in producing are as 

 incapable of changing their into as they are of melting 

 charcoal or of decomposing a substance which is not a 

 compound. If, however, these peroxides are mixed with 

 substances which combine either with their oxide or with 

 their oxylized oxygen, then the decomposition takes place 

 with the greatest ease. 



' ' - 5 



OF THE 



{ UNIVERSITY ] 



OF 



