Figures 244-253. — Primary erythrocytes — mature and abnormal. 2,470X. 



FiGURB.s 244-248: Mature primary erythrocyte.'^. 



244, 245 Same slide. Embryo incubated G days 22 hours. 

 The second cell has taken on a slightly oval 

 shape. 

 24(5 A rare example of constricted cytosome as well 

 as nucleus, characteristic of amitosis. Embryo 

 incubated 9 days 14 hours. 



247 The primary erythrocytes are distinguished from 

 later generations of red cells by the more intense 

 coloration of the cytoplasm. Embryo incubated 

 8 days 21 hours. 



248 A primary erythrocyte in which an oval shape 

 has developed. Embryo incubated 11 days 1 

 hour. 



Figures 249-25.3: Abnormal primary erythrocytes. 



249 A primary erythroplastid with a body of chro- 

 matin material still remaining. Elmbryo in- 



hours. Many examples of 

 erythrocytes are found in 



cubated 1.3 days 15 

 degenerating primary 

 older embryos. 



250 Poor stainability of the nucleus is characteristic of 

 aging primary erythrocytes. I'mibrj'o incubated 15 

 days 23 hours. 



251 A giant late polychromatic erythrocj'te — very rare. 

 Xuclear chromatin less dense than normal, thereby 

 revealing clearly the nucleolus. Found in same slide 

 from which figure 240 was taken. 



252 Karyorrhexis of nucleus in a primary erythroblast 

 or an early polychromatic erythrocyte, observed 

 rather regularly at young ages. Embryo incubated 

 2 days 18 hours. 



253 Polynuclear primary erythrocyte. Cell shows evi- 

 dence of aging and decadence. Embryo incubated 9 

 days 14 hours. 



120 



