42 



STEM. 



82. Corm. Draw a median longitudinal section of the corm of Colocasia, showing : 

 corm of present year, last year, and rudiment of next year ; scale-leaves ; buds ; adventi- 

 tious roots. 



83. Tuber. Draw a potato, showing : scale-leaves ; buds. Cut a section through 

 one of the buds and draw it under a hand lens. Examine the demonstration specimen 

 of a potato that has begun to sprout. 



