A 



B 



Figure 224. — Blood from dorsal aorta of early chick embryo. 1,370X. 

 Slides of embryo blood stained with May-Grunwald Giemsa. 



B Incubation age, 1 day 23 hours. 



A Incubation age, 1 day 22 hours. 



1-10 Typical early primary erythroblasts with lobulated 



basophilic cytosome and 1 or 2 nucleoli. 

 11-15 Small shrunken primary erythroblasts. Frayed 

 and shrunken appearance of some cells probably 

 due to delay in drying the cells; especially true of 

 11 and 12. 



16 Primary erythroblast in mitotic division. 



17 Slightly smudged erythroblast. 



1- 2 Large primary erythroblasts, similar to the stage 



shown in A or younger. 

 3-20 Late primary erythroblasts of various sizes from 

 large (14 and 16) to small (18 and 19). 

 21-22 Large primary erythroblasts in mitotic division. 

 23-24 Small cells with lobulated cytosomes. Probably 

 early embryonic thrombocytes. 



94 



