164 



AGE, GROWTH, AND DEATH 



pictures are taken from the living egg, and the living 

 egg is not transparent. Here (No. 4), it is dividing 



FIG. 59. Amblystomum punctatum. PROGRESSIVE SEGMENTATION OF THE OVUM. 

 I, unsegmented ovum; 9, advanced segmentation. After A. C. Eycleshymer. 



into four, here (No. 5), the upper portion of the four 

 cells has been split off, and we have seven cells showing 



