Figure 228. — Blood from heart of chick embryo. Incubation age, 9 days 15 hours. 1,370X. 



1-3 Mature primary erythrocytes. 

 4, 6-10 Late polychromatic erythrocytes from later 

 embrj'onic red-cell generations. 

 11-13 Late polychromatic erythrocytes in which the 

 artifacts of cytosomal fracturing are present. 

 5, 14-18 Mature erythrocytes from later embryonic 

 red-cell generations. 



19, 20 Smudged erythrocytes. 



21 Small embrj'onic thrombocytes that have 

 clumped, accompanied by degeneration as 

 shown by loss of cytoplasm and by pyknosis 

 of the nucleus. 



22 Embrj'onio macrophage. 



103 



