In this modified alizarin red-s method the fetuses were fixed in 10 per cent Neutral buffered formalin for 1 week. Reduced the potassium hydroxide digestion time to secure the muscular system and then stained with alizarin red-s. Excess stain was removed by fresh 4 per cent potassium hydroxide solution. Stained fetuses were cleared for 2 weeks by using two clearing agents. The primary ossification centers of the skull bones were clearly visible. The fetuses were preserved in glycerin.