656 [June 18, 



stances. The peroxide is separated by solution in ether from the 

 water in which it is dissolved and suspended. These substances are 

 dense oily fluids, exploding slightly when heated, but not so readily 

 decomposible as the peroxide of acetyl. The analysis of the peroxide 

 of butyl, dried by chloride of calcium, gave results corresponding with 

 the formula C 8 H u O 4 . 



Calculated. Found. 



C 8 ........ 96 ........ 55-17 ........ 55-11 



H 14 ........ 14 ........ 8-05 ........ 8-28 



O 4 ........ 64 ........ 36-78 ........ 36-61 



174 100-00 100-00 



The analysis of the peroxide of valeryl gave results corresponding 

 with the formula C 10 H 18 O 4 . 



Calculated. Found. 



C 10 ........ 120 ........ 59-40 ........ 59-39 



H 18 ........ 18 ........ 8-91 ........ 9-17 



O 4 ........ 64 ........ 31-69 ........ 31-44 



202 100-00 100-00 



The mode of formation of these peroxides is given in the equation 



These substances are decomposed as well as formed by the action of 

 the alkaline peroxide, according to the equation 



R 2 O 2 +Ba 2 O 2 =2BaRO + O 2 , 



giving a striking example of those consecutive actions referred to in 

 a former paper as the cause of certain catalytic decompositions. 



The action of the bibasic anhydrides on the alkaline peroxides is 

 of special interest. 



When anhydrous succinic acid, lactide, or anhydrous camphoric 

 acid is mixed with an equivalent of hydrated peroxide of barium, a 

 solution is obtained possessing the most powerful oxidizing properties, 

 which bleaches indigo, evolves chlorine with hydrochloric acid, and 

 oxidizes the protosalts of iron and manganese, but which does not 

 discolour permanganic acid, or give with chromic acid the blue colour 

 formed by peroxide of hydrogen. When boiled, the solutions evolve 

 oxygen, and afterwards contain a salt of the acid employed in the 

 case of succinic acid, giving a crystalline precipitate of succinate of 



