Smallwood. — Maturation Hamiuea. 



PLATE 5. 



Fig. 25. Metaphase of first maturation. The centriole in the deep centrosome is 

 represented by several small granules. The chromosomes are still in 

 the tripartite condition. Iron haeraatoxylin and Bordeaux red. 

 X 1920. 



Figs. 26, 27. Beginning of anaphase of first maturation. The chromosomes are 

 moving toward tiie poles of the spindle. Iron hsematoxylin. X 1920. 



Fig. 27a. Tlie centriole in the dumb-bell stage. Taken from an egg in the 

 anaphase. Iron hsematoxylin. X 1920. 



Fig. 28. Late anaphase of first maturation. The centriole has broken up into a 

 number of granules. In the outer centrosome no differentiation 

 (centriole) is found in the centroplasm. Iron haematoxylin and 

 Bordeaux red. X 1920. 



Fig. 29. Chromosomes are dividing. A deeply staining chromatin thread exists 

 between the components of each pair. Iron haematoxylin. X 1224. 



