Three liquids of densities $ρ_1$, $ρ_2$ and $ρ_3$ (with $ρ_1$ > $ρ_2$ > $ρ_3$), having the same value of surface tension T, rise to the same height in three identical capillaries. The angles of contact $\theta_1$, $\theta_2$ and $\theta_3$ obey