50 M.Thmardonthe [Jan. 



Oxide of' Nickel In/ Calcination. Very evident effervescence 

 of oxygen from tlie peroxide of hydrogen. 



Protoxide of manganese ^ iron, tin, cobalt. These protoxides, 

 ■when in the state of hydrates, are converted into peroxides in 

 the same way as those already described. When oxygenated 

 water is poured upon these hydrates recently precipitated by 

 potash from their solution in acids, they are immediately peroxi- 

 dized. The peroxides of manganese and cobalt will afterwards 

 act upon the undecomposed peroxide, causing the rapid expul- 

 sion of its oxygen in the state of gas ; the action of the peroxide 

 of iron is not very strong, and that of tin produces no sensible 

 effect. 



Oxide of Arsenic becomes acidified. 



Of the Oxides ichich expel Oxi/genfrom the Peroxide of Hydrogen 

 without being Peroxidized or Deo:i,idized. 



There are a considerable number of oxides which possess this 

 property; they will be described as nearly as possible in the 

 order of their power of decomposing. 



Native peroxide of manganese in fine powder, with concentrated 

 peroxide of hydrogen. Sudden and very violent action; the heat 

 occasioned so great as to make the tube burning hot; the 

 deoxidation of the peroxide of hydrogen instantaneous and 

 complete. 



The same oxide of manganese with peroxide containing only 

 nine volumes of oxygen. Very brisk and sudden effervescence ; 

 all the oxygen disengaged in a very short time from the oxygen- 

 ated water. 



Veryfnely divided peroxide of manganese, obtained by adding 

 oxygenated water to a solution of manganese, and decomposing 

 the solution by potash. The action of this oxide is stronger than 

 that of the native oxide ; and when the experiment is performed 

 with the concentrated oxygenated water, it takes place with a 

 kind of explosion. 



Peroxide of cobalt in powder. This produces the same effects 

 with the concentrated peroxide of hydrogen as the native per- 

 oxide of manganese does. 



Massicot in powder and highly concentrated peroxide of 

 hydrogen. Violent action, great heat ; disengagement of all the 

 oxygen in a low minutes. 



Minium and peroxide of lead. These two oxides act also very 

 strongly upon the peroxide of hydrogen ; the action of the per- 

 oxide is extremely violent, and it becomes protoxide. 



Hydrate of peroxide of iron, and concentrated peroxide of 

 hydrogen. Action soon becoming very strong ; great heat, and 

 complete deoxidizement of the liquor in a very short time. 



Hydrate of peroxide of iro7i, and liquor containing only one- 

 ninth of its volume of oxygen. Very sudden effervescence, but 



