The size and size distribution measurements were carried out for single crystals of poly ethylene by an optical microscope. The single crystals were obtained from the dilute solutions (0.1 %) of polyethylene in p-xylene in the temperature range 74-94-degrees-C. It was observed that the mean size of the crystals increase from 15.11 to 32.98 mum at magnification 320 (47.22 mmu- 103.66 mmu) with increase in crystallization temperature, which may be attributed to the uncoiling of the folds with the rise in temperature.