32 THE CULTURE OF i'OT-PLANTS 



placed outside during the day in mild weather. While the 

 roots are few and short especial care in watering is necessary ; 

 but when they have permeated the whole soil, the chief 

 danger in summer is excessive heat and drought, the delicate 

 rootlets in contact with the pots being liable to be dried up 

 and killed. A sufficient supply of water will prevent this, 

 but at the same time the pots themselves should be exposed 

 as little as possible to the burning rays of the sun. If they 

 are in a window, some green tissue paper can be arranged 

 round as a protection. Pot- covers can be obtained which 

 serve the same purpose, or each pot can be placed in a bowl. 



