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NASTIC MOVEMENTS. 



87. Sleep movements. 



(a) Composite flowers with the ray-floret petals in day and night positions. 

 (6) Leguminous leaves with the petioles and leaflets in day and night positions. 



88. Leaf movements due to degree of illumination. 



(a) Oxalis leaflets horizontal in the shade and folded downwards in direct 



sunlight. 



(b) Rapid closing of leaflets of Mimosa pudica in darkness, or in bright light. 



