Fig. 54. 



FIG. 55. 



Fig. 56. 



Fig. 57. 



Fig. 54. The same plant after a few hours of equilateral illumination, following 

 the condition shown in Fig. 53. 



Fig. 55. Another castor bean plant grown under equilateral illumination. 



Fig. 56. The same plant as shown in Fig. 55 after being inverted for a few hours 

 under equilateral illumination. 



Fig. 57. The same plant after being set erect for a few hours under equilateral 

 illumination, following the condition shown in Fig, 56. 



