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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. 



