Figures 265-275. — Late developmental stages of embryo erythrocytes; also three cells that show 



technic artifacts. 2,470 X. 



265 Early polychromatic erythrocyte, typical of this 

 stage as seen in the late embryo, and after hatching. 

 Embryo incubated 5 days 22 hours. 



266 Mid-polychromatic erythrocyte. Cytoplasm frac- 

 tured. Embryo incubated 6 days 22 hours. 



Figures 267, 268: Late -polychromatic erythrocytes. Same 

 slide as figure 266. 



267 Nearly round cell. 



268 Slightly ovoid cell. 



Figures 269-272: Mature embryo erythrocytes. 



269 Mature erythrocyte. Embryo incubated 8 days 21 

 hours. 



270 Mature erythrocyte. The large cell size, the con- 

 densed nucleus, the small nuclear size relative to the 

 cytosome, and the color of the cytoplasm, all suggest 



271 



272 



that this cell may belong to the primary erythrocyte 

 series. Embryo incubated 11 days 1 hour. 

 Mature erythrocyte typical of the older embrj'o. 

 Embryo incubated 13 days 5 hours. 

 Mature erythrocyte identical with the red cell after 

 hatching. Embryo incubated 16 days. 



Figures 273-275: Cells shoioing the defect of cytoplasmic 

 fracturing. This generally occurs in the polychromatic 

 stages. 



273 Mid-polychromatic erythrocyte. Embryo incubated 

 5 days 18 hours. 



274 Late polychromatic erythrocyte. Disturbed stroma 

 but no unstained spaces. Same slide as preceding 

 figure. 



275 Late polychromatic erythrocyte. Partial margina- 

 tion of the hemoglobin-bearing stroma. Embryo in- 

 cubated 6 days 22 hours. 



124 



