The History of Plant Tissue Culture 25 





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WjLa>-i\ Qj-utx- \jYfij«-2> v^^-^-s 



Fig. 8. Margaret E. (Mrs. Warren H.) Lewis, 1881- . Re- 

 search Associate, The Carnegie Institution of Washington. Investi- 

 gator of animal tissue cultures, particularly of malignant tissues. 



