${\mathrm{Bi}}^{207}$ has been found to decay by electron capture accompanied by gamma rays of energies 0.569\ifmmode\pm\else\textpm\fi{}0.0015, 0.894\ifmmode\pm\else\textpm\fi{}0.007, 1.0639, 1.43\ifmmode\pm\else\textpm\fi{}0.01, and 1.771\ifmmode\pm\else\textpm\fi{}0.005 Mev having transition intensities of 100: 0.16: 87: 0.16: 8 percent per disintegration, respectively. $K$-conversion electron intensities are 1.7, 0.0039, 8.2, 0.0009, and 0.022 electrons per 100 disintegrations respectively. The 0.894, 1.43 and 1.771-Mev transitions have $K$-conversion coefficients of (2.4\ifmmode\pm\else\textpm\fi{}1)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}2}$, (5\ifmmode\pm\else\textpm\fi{}2)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$ and (2.5\ifmmode\pm\else\textpm\fi{}0.5)\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}3}$. The first of these is in agreement with $M1$ radiation and the latter two with $E2$ or $E2+M1$ radiations. Electron capture branches are 87 percent to the ${i}_{\frac{13}{2}}$ state at 1.633 Mev, 5\ifmmode\pm\else\textpm\fi{}2 percent to the 0.57-Mev first excited state and 8\ifmmode\pm\else\textpm\fi{}2 percent to a level at 2.35 Mev. Branching to the 2.35-Mev level proceeds only by $L$-capture as shown from the x-ray spectrum in coincidence with 1.78+0.57 Mev photopeak sum pulses. The decay energy to the 2.35-Mev level thus lies between 15 and 90 kev and the total ${\mathrm{Bi}}^{207}$ decay energy is 2.40\ifmmode\pm\else\textpm\fi{}0.04 Mev. Gamma-gamma and electron-gamma correlation experiments confirm the 1.06-0.57 Mev cascade as $\frac{13}{2}\ensuremath{\rightarrow}\frac{5}{2}\ensuremath{\rightarrow}\frac{1}{2}$ while the 1.78-0.57 Mev gamma-gamma correlation is isotropic to within 5 percent. A spin $\ensuremath{\ge}\frac{7}{2}$ for the 2.35 Mev state is supported by a crossover intensity of 6\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}5}$ per disintegration as determined with a photoneutron detector. An assignment of ${f}_{\frac{7}{2}}$ to the 2.35 Mev level is compatible with all of the data including the 1.78-0.57 Mev angular correlation, if the 1.78-Mev transition is assumed to consist of a mixture of \ensuremath{\sim}94 percent $E2$ and \ensuremath{\sim}6 percent $M1$. Fast-coincidence techniques have been used to show that the 0.57-Mev level has a lifetime of 4\ifmmode\times\else\texttimes\fi{}${10}^{\ensuremath{-}10}$ sec.