278 GERM-CELL CYCLE IN ANIMALS 



Fig. 76. — Mitochondria in the embryonic cells of the chick. A. In 

 cells of the primitive streak. B. In dividing connective tissue cells. 

 C. In connective tissue cells. D. In a cartilage cell. E. In osteo- 

 blasts and bone cells. F. In cells of Wolffian body. (From Dues- 

 berg, 1913; A, B, C, E, after Meves; D, F, after Duesberg.) 



