FiGUEE 344. — Bone marrow from a chicken, 145 tlavs old. 1,370X. 



1 Late erythroblast. 



2 Early polychromatic erythrocyte. 

 3, 4 Late polychromatic erythrocytes. 



5 Dividing late polychromatic erythrocyte. 

 6-8 Mature erythrocytes. 

 9 Thromboblast. 

 10 Early immature thrombocyte. Typical cell at this 

 stage for adult l^one marrow. Added to the draw- 

 ing from another Ijone-marrow smear. 



11 Disintegrating mature thrombocyte. 



12 Metagranuloblast. 

 13-15 Mature heterophils. 



16 Basophil mesomyelocyte. 



17 Mature or nearly mature basophil. 

 18-21 Lymphocytes, medium and small. 

 22-25 Cells slightly smudged. 



26, 27 Smudged naked nuclei. 



182 



