'TOVE bulbs and tubers are those which 

 require a greater heat than can be afforded 

 by a greenhouse. They are generally 

 =b natives of the swamps of tropical coun- 

 tries. During growth, they require heat and moisture, and, 

 if deciduous, a rest when the leaves begin to turn yellow at 

 a temperature not lower than 60 ; or, if evergreen, to have 

 only just water enough to prevent the leaves from flagging. 

 In the present volume, we propose only to describe a few 

 of those most commonly cultivated. 



THE CALADIUM. 



These bulbs were formerly considered arums ; the earliest 

 known being, even now, commonly called arum bicolor. 



248 



