ORIGIN OF BLOOD-VESSELS IN BLASTODERM OF CHICK. 



257 



In this scheme I have used the term blood-island in the sense of hemoglobin- 

 bearing cells attached to the inner wall of a vessel, while erythroblast is used in the 

 usual sense of free hemoglobin-bearing cells that are continuing to divide. For 

 the chick the question concerning the origin of the white cells must be concerned 

 with two possibilities; first, whether all of the white cells develop subsequently 

 from the mesenchyme outside the vessels that does not go through the stage of 

 differentiating into angioblasts; second, whether in later stages the endothelium 

 produces true lymphocytes that do not develop hemoglobin. 



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