Samples of higher oxides of silver were prepared by several chemical and electrochemical procedures. Two distinct higher oxides were produced. The first, argentic oxide, , is a black powder and has a monoclinic structure for which lattice constants are derived. There is no evidence of the existence of other crystalline forms of . The second oxide, with silver in a valence state higher than plus two, is present in some preparations along with . The stoichiometry was not determined. It is also black and has a face‐centered cubic lattice. It decomposed to gradually over a period of months.