Figure 2. Developing striated muscle frcm z 23rd day frog-embryo. At a and o 

 large turgid nuclei and at i and V collapsed nuclei are shown. The cytoplasm 

 of the myosyncytium which is undergoing fibrillation is comparatively achro- 

 matic and is in strong contrast to the deeply staining muscle fibrils that are 

 developing within it. X 1000. 



