Figure 6. Developing striated muscle from a 23rd day frog-embryo. The early 

 stages of fibrillation of the myosyncytium are shown. The cytoplasm is com- 

 paratively achromatic and shows the remains of the yolk granules in the form 

 of minute clear globules scattered throughout it. An enormous turgid nucleus 

 is shown, containing a very large deeply staining nucleolus. X 1500. 



