To become a Tertium Society member, you need to register, i.e. complete the membership declaration (below) and pay the membership fee for the given calendar year to the Society's account. According to the the Tertium Statues (Article 12), membership in the Society requires a decision of the Society's Board of Board admission - the Board makes such decisions at its meetings. In the absence of a written refusal, the registered person automatically becomes a member of the Society.