A liquid model was proposed wherein crystal embryos should exist in equilibrated melts at temperatures even above the melting point or liquidus temperature and the number density of embryos should decrease as the melting temperature increases. Crystallization behavior of a Li2O . 2SiO(2) glass was studied. Secondary heat-treatment (600 degrees C for 20-60 min) of the Li2O . 2SiO(2) glass induced different number of crystals depending upon the melting temperature in the range 1040 degrees-1300 degrees C and duration of heat-treatment t. The number density of crystals N decreased with increasing temperature of melting. The number density of pre-existing embryos was estimated from (N - t) diagram and was found consistent with what the proposed model claims.