116 
temperatures. He therefore explained the catalytic decomposition 
of hydrogen peroxide by alkalis on the assumption that these 
hydrogen peroxide addition-products with the alkalis are first pro- 
duced, thus: 
2i?OH + 3H 2 0 2 = H 4 i? 2 0 6 + 2H 2 0, 
and that these substances then undergo the following transforma- 
tions : 
(1) l^H^Oe = R^O^ + 2H 2 0 ; 
(2) R 2 0 4 + H 2 0 = 2ROH + 0 8 . 
He was led to assume the intermediate production of such peroxides 
as R 2 0 4 for the reason that the compounds such as H 4 K 2 0 6 turned 
yellow during decomposition. The work of Schone on these com- 
plex addition-products of hydrogen peroxide has been confirmed by 
the later researches of Forcrand ( 173 ), who has obtained evidence not 
only of the existence of such compounds as H 2 Ba0 4 and H 2 Ca0 4 , 
but also of still more complex derivatives such as CaO 2 10H 2 O 2 , and 
Moissan ( 304 ) from his investigation of the unstable blue compound 
of chromic anhydride and hydrogen peroxide, reached the conclusion 
that it must be represented by the formula H 2 Cr0 5 , or Cr0 3 .H 2 0 2 . 
Similarly, in order to explain the great 'acceleration caused by 
small amounts of molybdic and tungstic acids in the oxidation of 
hydriodic acid by hydrogen peroxide, Brode ( 101 ) has been led to 
assume the formation of permolybdic and pertungstic acids as the 
result of the action of the peroxide on the catalyzer, while nine 
years previously Cammerer ( 109 ) had obtained permolybdic acid, 
2Mo0 3 .H 2 O.H 2 0 2 , and pertungstic acid, W0 3 .H 2 0.H 2 0 2 , by boiling 
the ordinary acids with hydrogen peroxide, and still more recently 
Pissarjewsky and Mellikoff ( 325 ) and also Muthmann and Nagel ( 308 ) 
have obtained similar acids and their salts, some of the latter being 
very unstable and even explosive. According to Job( 226 ) cerous salts 
act as oxygen-carriers in the presence of hydrogen peroxide, probably 
through the alternate formation and decomposition of cerium peroxide. 
Petrenko ( 319 ) also, while studying the action of hydrogen per- 
oxide on sodium arsenate, obtained a compound having t’he com- 
position Na 9 As 3 0 17 .2lH 2 0. This he found to be a hydrogen perox- 
ide derivative having the following constitution: 3Na 3 As0 4 .5H 2 0 2 . \ 
16H,0. So also Kazanesky ( 248 ) obtained the compounds 
K 2 C0 3 .2PI 2 0 2 .12H 2 0, and K 2 C0 3 .3H 2 0 2 , and similarly Staedel 
( 41 °) found that on adding a 90 to 95 per cent solution of aqueous 
hydrogen peroxide to a concentrated solution of cadmium chloride, a 
compound was obtained which crystallized in silky needles contain- 
ing 23 per cent of hydrogen peroxide, the theor}?- for CdCl 2 .2H 2 0 2 
being 27.09 per cent. . J 
