Smaixwooo. — Maturation Hamiiiea. 



PLATE 11. 



All figures photographic reproductions of sections magnified 670 diameters, and 

 in reproduction reduced to about 450 diameters. 



Fig. 73. Propliase of second maturation figure ; longer or indirect process. Cliro- 

 mosomes surrounded by a nuclear membrane. Aciiromatic figure 

 surrounded by the medullary and cortical layers of the sphere. Iron 

 ha;matoxylin. (Compare Plate 7, Fig. 42.) 



Fig. 74. Prophase, second maturation, longer process. The achromatic figure is 

 still enclosed in the wall of tiie parent ccntrosonie. Ciiromosomes in 

 two groups (not in focus), each with nuclear membrane. Iron haema- 

 toxyiin and Bordeaux red. (Compare Plate 7, Fig. 41.) 



Fig. 75. End view of second maturation spindle focused at the level of deep (polar- 

 cell) end of tlie spindle. Same stage as that of Figure 73. 



Fig. 76. The central spindle between the two asters has almost disappeared ; it is 

 represented by a wavy deeply staining band. Iron hu;matoxylin and 

 Bordeaux red. (Compare Plate 7, Fig. 46.) 



Fig. 77. The vesicular nucleus, containing the chromosomes, lies midway between 

 the two asters, but the second maturation spindle has not been formed. 

 Brazilin. (Compare Plate 7, Fig. 47.) 



Fig. 78. Polar view of the deep centrosome of second maturation figure. Same 

 stage as that of Figure 73. (Compare Plate 7, Fig. 38.) 



Fig. 79. The nuclear membrane has disappeared, leaving the chromosomes free in 

 tiie cytoplasm, the granules of which are arranged into rows. Fine 

 fibres have grown out from the chromosomes a short distance toward 

 the poles. Brazilin. (Compare Plate 7, Fig. 49.) 



Fig. 80. Metapiiase second maturation, longer or indirect process. Brazilin. (Com- 

 pare Plate 8, Fig. 55.) 



