KOOT AND CROWN. 65 



They are also concave on their upper side, and 

 often show a system of channels which guides the 

 water to the stem, and thence to the tap-root and 

 short absorbing rootlets. The leaves of bulbous 



FIG. 10. CENTRIFUGAL AND CENTRIPETAL CONDUCTING OF WATER. 

 I. In a Caladium. 2. In a Rhubarb Plant. (" Pflanzenleben,") 



plants, like those of the Hyacinth and Tulip, all 

 slope inward and are concave on the upper side, 

 and often excavated into deep channels. Through 

 these channels the rainwater runs, and so reaches 

 that part of the earth where the bulb with its 



