An attempt is made to generalize the algebra of currents by inclusion of baryon number changing currents which connect baryons and mesons. In this algebra both baryons and mesons are grouped together in a representation, i.e. in a supermultiplet. The currents are constructed from a set of fundamental particles consisting of a spinor SU(3) triplet and a scalar triplet. Most of the important hadrons are included in a supermultiplet but the baryon decimet is not. The hadrons discussed here correspond to bare hadrons without the Yukawa interactions. Mass relations, cross sections and other consequences obtained from this symmetry scheme are discussed.