Volume IV/7 "Liquid Crystals" is devoted to criticallyselected and assessedfundamental data, mainly transitiontemperatures, which characterize the existing liquidcrystalline phases and states of a large number ofcompounds.All relevant references including the very important patentliterature and data (1850-1991) were collected in the database LIQCRYST, from which the present Volume IV/7 has beenderived by and individual critical choice of compounds,references and data.The printed tables offer an overall picture of the liquidcrystalline field. Furthermore the comparision ofcorresponding data and perhaps the elucidation ofstructure-function relationships is facilitated, whereas thedata base allows a facile access to any substructure andproperty search.