Explanation of signs. 

 -\- all plants show definite positive curvature. 

 -\-\- all plants show strong positive curvature. 

 no plants curved. 



— all plants show definite negative curvature. 



+ ? a few plants show slight positive curvature. 



— ? a few plants show slight negative curvature. 



Two different signs placed in the same space e.g. + means that the reaction 

 after about 1 hour was according to the first of these, after about 2 hours according 

 to the second. 



No previous illumination. 



No previous 

 illumination 



Energy of the unilateral illumination in C. M. S. 



22 



44 I 60 



++ ! ++ 



120 



++ 



500 



++ 



1000 I 4500 



++ + 



13.500 27.000 



c 

 o 



o £^ 



TABLE I. 

 Intensity of the omnilateral fore-illumination 5.5 CM. 



Energy of the unilateral after-illumination in C. M. S. 



"Sc= 4X5-58X5-5 5X12 lOX 12 5X 100 10 X 100 10X450|30X450i60 X 450 



Q o oj . 22 

 o 



44 



60 



120 



500 



1000 



4500 13.500 27.000 



10 sec. 

 100 sec. 

 3 min. 

 5 min. 

 20 mirr. 

 1 hour 



+4- 



++ 

 ++ 

 ++ 

 +4- 



+ 

 + 

 + 

 + 

 + 



+ 







+ 



— ? 



+? 







TABLE II 



