106 RHODA ERDMANN 



come the potency to form fat cells, fibroblast and 'histiotype' 

 wandering cells. Therefore the present series of experiments 

 does not prove anything concerning the views of the mono- or 

 duophyletic schools, of the formation of blood and lymph in the 

 bone marrow. Here renewed experiments should be made, the 

 different cell types after emigration should be isolated and sub- 

 mitted to conditions reproducing either the condition of the 

 blood or of the lymph. Only with still more refined methods 

 would it seem possible to elucidate, outside the body, the com- 

 plicated process of blood and lymph formation. 



But this series of experiments proves that the latent quaUties 

 of the basophil mononuclear cells in the meshes of the bone 

 marrow can arise de novo in the adult animal, because their 

 wandering phagocytic, fat-storing character has been made evi- 

 dent. This fact ought to be considered in dealing with the ap- 

 pearance of these, and related cell types in the blood and lymph 

 during diseases. 



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