Chapter XVIII
.) most frequently employed coloured (tinted) substances, for instance, K_{2}Cr_{2}O_{7}, which showed the rate of diffusion with very great clearness. Prof. Oumoff employed the method described in
.) most frequently employed coloured (tinted) substances, for instance, K_{2}Cr_{2}O_{7}, which showed the rate of diffusion with very great clearness. Prof. Oumoff employed the method described in