A possibility that the electromagnetic current may have a unitary singlet component has been investigated in connection with V9→ll̄ decays. The Maki-Hara model of elementary particles seems to be experimentally ruled out. As for the three-triplet model, it has been pointed out that we must have additional 1- vector mesons ρ′, ω′, and φ′ with nonzero charm quantum numbers in order to saturate a new sum rule. © 1969 The American Physical Society.