16 Göte Tnresson 



Table IV. 





Original 

 position 



Final 

 position 



Deviation 



1 



Ä prostratum BoucH. .. 



23, 19 



30, 38 



+ 7, + 19 



2 



A. pat. prostrntdtm 



12, G 



17, 23 



+ 5. +17 



3 



> » » 



34, 31 



66, 47 



+ 32, +16 



4 





107, 120 

 123, 129 



105, 120 

 117, 126 



-1- 2, + 0 

 + + 3 



It will be seen that positions requiring angular movements of up to 32" are 

 taken up within 4 hours. The rate of this movement is further demonstrated in 

 Table V, which gives the data for two individuals of Atriplex prostratnm Bough. 

 kept in a dark room for 3 hours and measured every hour. 



Fig. 4. Horizontally expanded rosettes of Sonchus arvensi^i growing 

 on the exposed beach. From Warming 1909. 



