EXPERIMENTAL RESULTS 



123 



f 



I 



t 

 / 



c4, 



Fig. 39. Nucleus and nucleolus of Acetabularia treated with dinitrophenol. Unna 

 staining (Brachet et a/., 1955). 



••§ 



• 



Fig. 40. Incorporation of labeled phenylalanine in isolated thymus nuclei. 

 Autoradiographic method (A. Ficq). 



