Note 14 — APPENDIX II
George Kamensky translation
The compounds of uranium prepared by Fairley seem to me especially instructive in understanding the peroxides. By the action of hydrogen peroxide on uranium oxide, UO3, a peroxide of uranium, UO4,4H2O, is obtained (U = 240) if the solution be acid; but if hydrogen peroxide act on uranium oxide in the presence of caustic soda, a crystalline deposit is obtained which has the composition Na4UO8,4H2O, and evidently is a combination of sodium peroxide, Na2O2, with uranium peroxide, UO4. It is possible that the former peroxide, UO4,4H2O, contains the elements of hydrogen peroxide and uranium peroxide, U2O7, or even U(OH)6,H2O2, like the peroxide of tin recently discovered by Spring, which has the constitution Sn2O5,H2O2.