The morphological change of salol crystals with respect to supercooling is studied by in situ observation method and the Kyropoulos technique. The relation between morphology and structure of salol crystals is analysed based on Hartman-Perdok's concept of periodic bond chains (PBC). Kihara's core potential model is used to extend PBC concept. The theoretical morphology derived by extended PBC method gives better fitting to observed morphology obtained by in situ observation method.