The radium-uranium ratio $V$ is given by $\frac{E(1-\frac{1}{2}nB)}{Z}$ where $2E$ and $Z$ are respectively the numbers of alpha-particles emitted per sec. per g of U or of Ra; $B$ is essentially equal to the actinium "branching" ratio; and $n$ is the number of actinouranium isotopes. Data on $V$, $E$, $Z$ and $B$ are considered in order to determine whether $n=1\mathrm{} or 2$. The results speak strongly in favor of the existence of only one actinouranium isotope.

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