114 BOTANY. 



Material and apparatus. Seedlings, moist chambers, corks and pins, as 

 in Chapter XVII. 



Seedlings in pots (beans, squash or pumpkin), \ocrn to \^cm high. 

 Potted hyacinths if they can be obtained. 



Seedlings grown in pots in the dark (about three weeks old), others of the 

 same age grown in the light. 



Some dark boxes with small opening at one side, to receive some of the 

 pots of seedlings. 



If possible some sunflower plants grown in pots, plants about zoctn to 

 y>cm high, and tall dark boxes to cover them when desired. 



Sunflower plants should be started two or three months in advance. 

 Potted oxalis, which is often grown in conservatories, is better to show in- 

 duced " sleep" movements. 



