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The electromagnetic radius of the neutrino is calculated by use of dispersion relations. If an intermediate vector boson is used, $$\left\langle {x^2 } \right\rangle = - 6\frac{{g^2 }}{{2\pi ^2 }}\frac{1}{{3m_B^2 }}\left[ {\log \frac{{m_B^2 }}{{m_1^2 }} + \frac{1}{6}} \right]$$ . If no intermediate vector boson is used, $$\left\langle {x^2 } \right\rangle = - 6\left( {\frac{G}{f}} \right)^2 \frac{1}{{4\pi ^2 }}\left( {\frac{{m_1^2 }}{m}} \right)^2 \frac{1}{{3m_\pi ^2 }}\left[ {\log \frac{{m_\pi ^2 }}{{m_1^2 }} - \frac{4}{3}} \right]$$ .

A stable neutral meson is described. Strong and weak interactions, and experiments designed to observe this particle are discussed. Finally, it is shown that if a scalar or pseudoscalar boson is odd under charge conjugation, it is stable or extremely long lived in the absence of neutral lepton currents.