The electrical conductivity of tetrabutylammonium picrate is measured in the liquid crystal phases of two 4-alkyloxy-4'-cyanobiphenyls as a function of the temperature and of the electrolyte concentration. The conductivity is corrected for the electrode polarization and the dielectric relaxation which are determined from the frequency dependence of the conductivity. The equivalent conductivity values in the nematic phase of a mixture of 4-pentyloxy-4'- cyanobiphenyl and 4-heptyloxy-4'-cyanobiphenyl are extrapolated to infinite dilution. The electrical conductivity in 4-octyloxy-4'-cyanobiphenyl is measured in the nematic and in the smectic phase. It changes continuously with the temperature in the region of the phase transition. The anisotropy ratio for both liquid crystals under investigation yields a strong dependence upon the concentration of the electrolyte. This behaviour is compared with results obtained for other liquid crystals
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F. Schneider (1978) studied this question.