U.-Milosi, in onion root-tip celh SO' C.Procesmn index hbU. a,ui cakMion of average absolute duration of the several mitctic stages. 



= Average absolute duration of stages. 



= Average absolute duration of mitotic cycle. 



Average duration of Ike ejitirc mitotic cycle when the resting 

 period is considered a stage. 



R (i. e., resting stage) = 36.32 per cent of entire duration = 33.26 r 

 10 active stagea= G3.67 per cent of entire duration = 58.30 t 



10 active 9tage3XR = 100.00 per cent of entire duration = 91.56 i 



