Chemistry of sulfonated nitrogen compounds was the subject of most attention for Divers while staying in Japan. In collaboration with Haga, he showed that the numerous complex acids belonging to this group of compounds are the products of the reaction between sulphurous and nitrous acids, the base being essential only in so far as it protects the products of the reaction against hydrolysis, and that, contrary to the statements of previous workers, normal sulfites and nitrites have no action on each other. Divers and Haga further showed that the primary product of the reaction between sulphurous and nitrous acids is always hydroxylaminedisulfonic acid and nothing else.