Some implications of a charge space of seven (rotationai) dimensions are considered for (I) particle classification, (II) strong interactions, and (III) weak interactions. The conclusions from this point of view are that (I) all particles except the photon and graviton can be incorporated in 7 dimensional charge space; lepton conservation must be abandoned, which introduces parity nonconservation into beta decay; (II) the one boson, two fermion interaction is pseudovector in form and induces no mass differences; the SIGMA -- LAMBDA mass difference arises from interference with a fundamental two boson, two fermion interaction of lower charge symmetry; the XI -N mass difference has an "intrinsic" basis and is not due entirely to strong interactions; (III) the weak universal Fermi interaction has signature - 1 under time reversal; the strangeness change DELTA S = plus or minus 1 is associated with 256 independent (in principle) terms; the rule DELTA I = plus or minus 1/2, needs further qualification because I = T + U where T and U are independent operators. (auth)