Ho/cr\ o-oxide in acetic anhydride, yet are oxidised by aqueous sulphuric-chromic acid faster than the epoxide is hydrated by aqueous sulphuric acid of the same strength. It is these observations which have confirmed the view that the epoxide is not the true intermediate in the oxidation, but that in suitable circumstances it can be derived from some addition complex of the olefin and the oxidising agent. In an earlier paper, it was suggested that ...