eneral considerations with regard to the method of formation and half-life of the parent substance, and the energies of all the members of the series suggest a collateral branch of the 0n+0 family: $_{00}$Pa$^{000}\stackrel{\alpha}{\longrightarrow}_{00}$Ac$^{000}\stackrel{\alpha}{\longrightarrow}_{00}$Fr$^{000}\stackrel{\alpha}{\longrightarrow}_{00}$Fr$^{000}\stackrel{\alpha}{\longrightarrow}_{00}$Bi$^{000}$(RaE)." In a table summarizing the energies and half-lives of the decay chain only the $\alpha$-decay energy was given for $^{000}$