The systematic investigation of the miscibility between l.c. phases in binary systems by the Halle Liquid Crystal Group was extended to the following homologous series 2-[4-n-Alkylphenyl]-5[-4-n-alkoxyphenyl]-pyrimidines, N-[4-n-alkyloxybensylidene]-4-n-alkyl-anilines, Terephtylidene-bis-[4-n-alkyl-anilines], 4-n-Alkoxyphenyl 4-n-alkylcyclohexanecarboxylates. The different variants of polymorphism in these series including the phase types N, A, C, F, B and G are discussed with respect to structural informations especially on the ordered smectic phases of the types F, B and G. A new phase type H has to be established. These phases are low temperature modifications in the sequence FGH of the tilted ordered smectic phases