381 



2D 



A-O 



60 



80 



lOQMIN. 



DONKER 



90M.K. 



AVENA 5ATIVA KQLEOPTIEL) 



64M.K 



DOMKER 



O 



20 



AO 



50 



ÖO 



lOOMIIH. 



^?^ 



SINAPIS ALBA (WORTEL) 



DONKER 



35aa^,K 



Z:!: 



3500M.K DOMKER 



G 



20 



^0 



6G 



ÖO 



100 MIN. 



EXPLANATION OF THE FIGURES. 



These figures have been arranged in twos, in such a way, that above the 

 process of growth has been represented when the organ after having been in dark, 

 was permanently exposed to light (|) below the organ made dark (| ) after having 

 been exposed for hours. The height of the dotted space represents the rale of 

 growth. In the case of Phycomyces the two growth-curves have been plotted 

 according tu the average progress of a number of individuals; the cardinal points 

 are indicated by X For all the other organs the curves have been composed of 

 the figures found for one of the individuals. The curve for the coleoptile of Avena 

 sativa has been plotted after an individual reaction after Koningsberqer. 



How these curves have been plotted will be further discussed and explained in 

 the more detailed publication. 



25* 



